14 best engine coolants

Engine coolants, also commonly known as antifreeze, play a crucial role in maintaining the proper operating temperature of a vehicle's engine. Here are some key points about engine coolants:

  1. Purpose: The primary purpose of engine coolant is to absorb and dissipate heat generated by the engine.It helps in preventing overheating and ensures that the engine operates within a safe temperature range.

  2. Composition: Traditional engine coolants are typically a mixture of water and ethylene glycol, though some formulations use propylene glycol or other chemicals. The mixture is usually around 50% water and 50% antifreeze.

  3. Antifreeze Properties: One of the critical functions of engine coolant is to prevent freezing in cold temperatures. It lowers the freezing point of water, allowing the coolant to remain in a liquid state even in sub-zero temperatures.

  4. Boiling Point Elevation: Engine coolant also raises the boiling point of water, which helps in preventing the engine from overheating in hot conditions.

  5. Corrosion Protection: Coolants contain additives that help protect the engine and cooling system components from corrosion. These additives form a protective barrier on metal surfaces.

  6. Lubrication: Some engine coolants contain lubricating additives that help reduce wear and tear on the water pump and other components.

  7. Types of Coolants:

    • Ethylene Glycol: This is the most common type of antifreeze. It's highly effective but can be toxic, so it's important to handle it with care.
    • Propylene Glycol: This is a less toxic alternative to ethylene glycol. It's often used in environments where toxicity is a concern, such as in food processing plants or with pets.
  8. Coolant Colors: Coolants come in various colors, including green, red, blue, and orange. It's important to use the type of coolant specified by the manufacturer for your particular vehicle.

  9. Maintenance:

    • Checking Coolant Level: Regularly check the coolant level in the reservoir when the engine is cold. Top it up if necessary.
    • Coolant Flush: Periodically, it's recommended to flush and replace the coolant to ensure it maintains its effectiveness.
  10. Compatibility: It's crucial to use the coolant recommended by the vehicle's manufacturer to ensure compatibility with the materials used in the engine and cooling system.

  11. Environmental Considerations: Disposing of coolant should be done in an environmentally responsible manner, as ethylene glycol, in particular, can be harmful to the environment.

Remember to consult your vehicle's owner's manual or seek advice from a qualified mechanic if you have specific questions about the type of coolant to use in your vehicle.

Below you can find our editor's choice of the best engine coolants on the market
  

Engine Ice TYDS008 High Performance Coolant - 0.5 Gallon

Engine Ice

Based on 2 reviews Check latest price

Product description

Engine Ice Hi-Performance Coolant is biodegradable, phosphate free and non-toxic, typically reduces operating race temperatures and effectively keeping boil over temperatures to 256° Fahrenheit or less and freeze-up protection to -26° Fahrenheit. With an average reduction in operating temperatures of 10° Fahrenheit - 20° Fahrenheit Engine Ice is perfect for racing or street, motorcycle or auto, ATV or snow machine. Engine Ice Hi-Performance Coolant is legal in CCS and ASRA road racing and permitted at many tracks around the world. Engineered to keep your operating temperatures at optimum performance to not lose power through excess heat. Engine Ice is safe for aluminum and most all metals. Uses propylene glycol, which has been proven to eliminate water pump gasket and seal failures. It has also shown in high load, high stress conditions to reduce operating temperatures more than standard coolants.

  • Engine Ice hi-performance coolant is biodegradable, phosphate free and non-toxic, typically reduces operating race temperatures and effectively keeping boil over temperatures to 256° Fahrenheit or less and freeze-up protection to -26° Fahrenheit
  • With an average reduction in operating temperatures of 10° Fahrenheit - 20° Fahrenheit Engine Ice is perfect for racing or street, motorcycle or auto, ATV or snow machine
  • Engine Ice hi-performance coolant is legal in CCS and ASRA road racing and permitted at many tracks around the world. Easy to Use – Premixed with deionized water for out-of-the-bottle use.
  • Engineered to keep your operating temperatures at optimum performance to not lose power through excess heat; Engine Ice is safe for aluminum and most all metals
  • Uses propylene glycol, which has been proven to eliminate water pump gasket and seal failures; it has also shown in high load, high stress conditions to reduce operating temperatures more than standard coolants

User questions & answers

Question: Can i use this my 2001 jeep grand cherokee laredo and 2003 toyota corolla ce
Answer: Yes, but it will be much more expensive than mass market automotive coolants. Most other coolants are ethylene glycol (EG), this is propylene glycol(PG). This (Engine Ice) coolant is more environmentally friendly and does work a little better for cooling. I use it in my motorcycle for track use because most tracks ban EG - because EG's toxic and slick if spilled on the track. If you use this, flush your old system as thoroughly as possible with demineralized or distilled water to avoid diluting this new coolant with left over EG. Look up PG and EG on Google to see other pros and cons...
Question: Do i have to do a flush, or is this coolant okay to be mix
Answer: Iit is diffent than regular coolant. I flushed with water and then added. See one is propylene glycol and the other may be ethylene glycol. I believe engine ice is propylene glycol.
Question: Does this come prediluted
Answer: As previously stated, Engine Ice is prediluted. I own a Honda CRF450X and one container was more than enough for my bike.
Question: Can I use this in my 2009 Yamaha fz6r
Answer: Yes. I actually called Yamaha Headquarters before putting it in my 07 Yamaha R1 just to be sure that it was safe. Yamaha said they can't recommend it as they have their own product line but it's completely safe to use. I'm extremely pleased with it myself, my bike runs 20° cooler now, I kid you not. It's been great for me so far and I put it in approx 3 months ago or so. Go for it, you won't be disappointed. Flush the old fluid out with DISTILLED water until it comes out as clear as possible then put the engine ice in. I would def purchase again.

Product features

Engine Ice Hi-Performance Coolant

Engine Ice Hi-Performance Coolant is biodegradable, phosphate free & non-toxic; typically reducing operating race temperatures and effectively keeping boil over temperatures to 256°F or less and freeze-up protection to -26° F.

The Engine Ice Hi-Performance Coolant formulation has shown outstanding performance in testing that measures its ability to prevent corrosion within all cooling systems, including aluminum, copper, cast iron, steel, magnesium & solder. Engine Ice Hi-Performance Coolant has shown excellent performance in all of the AS D 5216 (Propylene Glycol Base Engine Coolant) tests. Also, Engine Ice Hi-Performance Coolant meets all the corrosion performance requirements of AS D 3306 & AS 4985 (the main specifications for premium ethylene glycol antifreeze). Plus it will not harm your seals or gaskets. Engine Ice Hi-Performance Coolant meets or exceeds all AS (American Society for Testing and Materials) and SAE (Society of Automotive Engineers) Standards and Requirements. These are industry standards in most everything mechanical and engine-based, including motorcycles and cars.

Performance right out of the bottle

Engine Ice Hi-Performance Coolant ready to provide you with dependable horsepower and is proven to reduce operating temperatures. The key to horsepower is not losing it! Engine Ice Hi-Performance Coolant is engineered to keep your operating temperatures at optimum performance to not lose power through excess heat.

Engine Ice Hi-Performance Coolant will provide you with dependable power and reduced operating temperatures regardless of the terrain you tackle.

Engine Ice Hi-Performance Coolant has an excellent high heat capacity and thermal conductivity characteristic, which in testing, has proven to exceed the abilities of most (ethylene glycol) coolants. It provides efficient & effective engine heat transfer.

Engine Ice Hi-Performance Coolant is a proven product, with added environmental benefits to assure the longevity of your engine, and the world we play in.

Ready to Use

Engine Ice Hi-Performance Coolant is pre-mixed with de-ionized water. The process of de-ionizing water eliminates all of the impurities that can do harm to your cooling system. Regardless if you are using tap, bottled, distilled, spring or R/O (reverse osmosis) waters, it can still contain minute particles of iron, magnesium, rust, lime and calcium. Many of these waters also contain chemicals, such as chlorine, fluorides and acids. Want proof? Take two different brands of distilled waters and perform your own taste test. They each taste different don’t they? If water were water, why would they be different? It’s because of the varying amounts of chemicals and minerals in these waters. These minerals and chemicals are what is the cause the scarring, scaling and mineral build-ups in your cooling system. Many also attribute these minerals and chemicals to water pump seal and gasket failures.

Formulated with Propylene Glycol

As compared to the ethylene glycol used in most other brands, propylene glycol is far less toxic and safer for children, pets, and wildlife. Engine Ice Hi-Performance Coolant is also phosphate free (phosphates kill the smallest forms of life in the environment in addition to trees and plants). Propylene glycol comes in both an industrial form and a pharmaceutical form and is used in many consumer products including hair conditioners, cosmetics, and many over-the-counter medications.

Propylene Glycol, the base fluid of Engine Ice Hi-Performance Coolant , meets or exceeds all AS, SAE, Government and Manufacturers standards. It also has NO statutes or health warnings from the Clean Air Act Amendments (CAAA), CERCLA (Superfund), Superfund Amendments & Re-authorization Act (SARA), Occupational Health & Safety Administration (OSHA), American Conference of Governmental Industrial Hygienists (ACGIH), Federal Health & Safety Administration (FHSA).

Mopar 10 Year/150,000 Mile Coolant 50/50 Premixed

Mopar

Based on 1 reviews Check latest price

Product description

ANTI-FREEZE WARNING: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

  • Package Weight: 4.227 kg
  • Product Type: Auto Part
  • Package Quantity: 1
  • No Batteries Required

User questions & answers

Question: This is the exact coolant my manual says to buy but in the match your vehicle drop down it's saying this is not a match for my 2014 grand Jeep Cheroke
Answer: I believe that is because the Mopar part number is not in the title. I compared it with another listing to make sure. It says the right MS spec on the bottle.
Question: Is this the right coolant for my Jeep Wrangler jk
Answer: YES! This is the OAT coolant your 2013+ Jeep JK needs! Do not use the 5 years / 100k HOAT type!!! These 2 varieties DO NOT mix and will clog up your system.
Question: Does this work in a 2017 jeep wrangler? I was told it wouk
Answer: If your vehicle calls for MS-12106 then this is the coolant you need. On my 2017 Pacifica it was labeled right on the filler cap.
Question: what color is it
Answer: I just bought this exact product. It’s 50/50 and it’s already prediluted. You do not add water to this product. The color is purple on the 50/50 not pink as some have stated.

Genuine 00272 SLLC2 Engine Coolant / Antifreeze

Genuine

Based on 443 reviews Check latest price

Product description

this listing is for part number 00272 SLLC2

  • Single Quantity
  • No Core Charge Req.
  • Weight: 9.34lbs
  • Contains a bittering agent

User questions & answers

Question: Is this the correct coolant for 2012 scion tc
Answer: Scion is not Nissan, Scion is Toyota. Whether your Scion uses the pink or red coolant though I cannot answer that. Search the toyotaowners website for the service manual and verify there.
Question: Is this a toyota pink or red
Answer: This is considered a Toyota Pink antifreeze as it is premixed 50/50 with distilled water. Please feel free to call or email us anytime you have any questions or if you need anything else. Thank you BMA Auto Parts 888-262-3911
Question: Description saids needs to add water or dilute but comments said its 50:50 mix pink color not red. So what is it
Answer: It’s pink and already comes 50:50 mixed
Question: is this concentrated
Answer: This is NOT concentrate. This is premixed 50/50. In case you would like the concentrated version, you will want to order: https://www.amazon.com/dp/B000ECIYAM?m=A3TZ17P9C9C3UR&ref_=v_sp_detail_page Please feel free to call or email us anytime you have any questions or if you need anything else. Thank you BMA Auto Parts 888-262-3911

EVANS Cooling Systems EC53001 High Performance Waterless Engine Coolant, 128 fl. oz.

EVANS

Based on 475 reviews Check latest price

Product description

Evans High Performance Waterless Engine Coolant, EC53001, is specifically designed for all modern, classic, and vintage gasoline engines, light duty diesels, LP and CNG vehicles. Evans High Performance Coolant (HPC) defends against boil-over and corrosion while allowing the engine to continue producing its peak horsepower. When converting an engine from a water-based coolant to HPC, great care should be given during the installation (conversion) process to ensure that all of the old water-based coolant and water is removed before installing HPC. It is recommended that the system be flushed with Evans Prep Fluid prior to installing HPC When the installation is complete, the water content of the coolant should be no more than 3 percent for optimum performance. Evans HPC coolant contains a bittering agent/bitterant. Evans coolant is proudly made in the USA.

  • Specifically designed for all modern, classic, and vintage gasoline-powered vehicles, light duty Diesels, LP and CNG vehicles
  • Has a boiling point of 375 DegreeF and will not vaporize, eliminating boilover and after-boil Generates low vapor pressures, prevents coolant loss, and reduces strain on cooling system components
  • Contains no water, effectively eliminating corrosion, liner and water pump cavitation erosion Minimizes the potential for corrosion and electrolysis issues, and reduces maintenance costs
  • Eliminates pre-ignition and engine knock caused by overheating, improving combustion efficiency to deliver more power and improved fuel economy
  • During installation ensure that all of old water-based coolant and water is removed before installing this product

User questions & answers

Question: DODGE 1968 blown gas, new aluminum heads, cast iron block, aluminum water pump, Are isues with different metals? ALL NEW
Answer: Hi,Evans coolant is a propylene glycol based coolant that is very non reactive. It does not corrode or change over time . Jay Leno has used it in his expensive Dusenbergs for over 15 years. For me it is a lifetime coolant. Be sure to flush all water out of your system (up to 3 percent is ok) and only add Evans coolant to your system.Gordon
Question: Does this come with the warning stickers? Also is one gallon of prep enough to flush out a v6 engine block
Answer: Before using the prep, I would recommend draining coolant by opening radiator, or overflow cap and draining from the low point on bottom of radiator. Use an air compressor and a rag and make a seal over radiator cap or overflow hole and blow the rest of that coolant out. Then you can put the prep fluid in, and some waterless coolant if needed and let your system circulate a few cycles before draining, and filling completely with the waterless coolant. Or you can just buy a boat
Question: Why is it 6 dollars cheaper to order 1 gallon 4 times than ordering 4 gallons in one order? Do the math
Answer: I am not the pricing guy. I would just order that one gallon 4 times if I were you.
Question: Does this come with the testing kit? And do the test strips expire
Answer: Both the Evans test strips and conversion kits were discontinued over a year ago. The test strips do have an expiration date, any test strips that may still be in circulation have expired. We are trying to remove all Amazon listings depicting either the test strips or conversion kits. Any questions concerning testing the water content of your coolant after converting your vehicle to Evans Coolant, please call the Evans tech line 888-990-2665 M-F 9am to 5pm eastern or e mail [email protected]

Product features

Evans High Performance Engine Coolant

Evans Waterless Coolants have a boiling point of 375°F, well above the boiling point of other engine coolants. This eliminates the vapor barrier that can cause hot spots and pre-ignition in engines with water based coolants. Evans Waterless Coolant ensures that the coolant remains in a liquid state and in constant contact with your internal engine components for consistently effective cooling.

Corrosion and Electrolysis Protection

Water is very corrosive and a good conductor of electricity. By eliminating water in your cooling system. Evans Waterless Coolants virtually eliminates corrosion and electrolysis when compared to water-based antifreeze.

Reduced Vapor Pressure

With heat water generates steam in you cooling system, causing high vapor pressure that exerts internal stress on cooling system components. With Evans High Performance Waterless Coolant, this pressure is dramatically reduced, extending the cooling system's operating life and preventing breakdowns.

Valvoline Multi-Vehicle 50/50 Prediluted Ready-to-Use Antifreeze/Coolant 1 GA

Valvoline

Based on 599 reviews Check latest price

Product description

MaxLife™/Multi-Vehicle Antifreeze/Coolant is the only antifreeze that contains Alugard™ Plus, a patented additive that makes it compatible with any other color antifreeze. This universal formulation helps extend the life of your vehicle by keeping your vehicle's engine temperature stable in all climates and driving conditions by transferring heat from the engine to the radiator. Other antifreeze brands claiming 'all makes, all models' use a corrosion inhibitor package without silicate. These chemistries, when mixed together, may fail to protect the cooling system from rust and corrosion.

  • Recommended for use in all makes, all models, all mileages and compatible with all colors
  • Only antifreeze to contain Alugard Plus, a special additive that allows these chemistries to work together to provide maximum protection
  • Lubricates gaskets and seals
  • Helps protect against cold weather freeze-ups and hot weather boil-overs
  • Contains 30 – 50 ppm of denatonium benzoate as a bittering agen

User questions & answers

Question: When I Looked up this one popped up for dexcool. What’s the difference
Answer: I just had it installed a day ago it seems to have better power. And it also has seems to have better shift points I tried to program it for gas mileage doesn’t seem to of helped as of yet
Question: Is this a pink
Answer: The box it came in said it was for 2017 and up
Question: Is this green coolent
Answer: Yes, you can. But for best results, you should use with an oil change.
Question: What is the difference between this and Valvoline long life coolant for asian vehicles which sells for
Answer: HI Jon. Yes, I have noticed an improvement in oil consumption. We have a 02 Chevy Avalanche with about 220k on it and it would generally need a quart added between changes. We now add the Lucas Stabilizer as part of the oil change and there is now no need to add oil between changes. Also of note is that we had an annoying valve tappet noise when cold starting the engine. With the addition of the Lucas this has been significantly reduced. My Quicklube oil change shop does not carry Lucas but I order it on Amazon and take it with me and they add it. Hope this helps. Oh, one more thing, the Lucas automatic transmission additive is also extremely effective. Happy motoring.

Product features

MaxLife Valvoline Universal Antifreeze/Coolant, Ready to Use - 1gal (719005)

Maxlife Coolant/Antifreeze helps extend the life of vehicles by keeping the engine temperature stable in all climates and driving conditions. MaxLife provides long-life protection by means of a unique patented formulation with superior anti-corrosion inhibitors and anti-scaling chemistry. It protects the cooling system against freezing and over-heating by keeping it clean. Available in concentrate and 50/50 RTU.

  • Recommended for use in all vehicle makes and models.
  • Helps protect against cold weather freeze-ups and hot weather boil-overs.
  • Compatible with all colors of antifreeze in case of mixing .

Shell Rotella ELC Nitrite Free Antifreeze/Coolant Concentrate 1 Gal.

Shell

Based on 18 reviews Check latest price

Product description

Shell Rotella ELC-NF provides improved protection of aluminum components including modern brazed aluminum heat exchangers and meets many of the newest OEM specifications. The versatile formulation may also be used in fleets that include passenger cars and light duty trucks. The coolant is proven for extended life operation in medium- and heavy-duty diesel, gasoline, and natural gas vehicles and engines. Shell Rotella ELC-NF offers outstanding heat transfer that is superior to conventional coolants as well as excellent cavitation (pitting) and related damage protection on cylinder liners. It can help extend the life of water pumps, radiators and other cooling system components. Rotella ELC NF offers superior heat transfer compared to conventional coolants and is compatible with other extended-life coolants. Finally, it has no supplemental coolant additives (SCA) or extender use required for the life of the coolant. Unlike other coolants, extended life coolants are designed to go 600,000 on-highway miles or 12,000 hours in commercial applications (and beyond with proper monitoring) and provide overall reduction in cooling system maintenance. Extended Life Coolants also offer complete cooling system component protection by helping to reduce water-pump failures, hard-water-scale deposits and silicate gel.

  • Shell Rotella ELC OAT Technology- Service life of 600,000 miles/1,000,000 km/12,000 hours/6 years in Med./Heavy Duty Applications and 150,000 in passanger cars/Lt. Trucks
  • Excellent protection against pitting, corrosion and erosion even on hard to protect metals like aluminum.
  • Minimized maintenance and related costs — Requires no regular testing with proper top-up practices and helps eliminate the need for supplemental coolant additives.
  • Variable Applications — Excellent protection for heavy duty engines where the OEM specifies a nitrite free coolant. Can be used in all heavy duty engines using reduced emission protocols

User questions & answers

Question: Is this safe to use in a 2000 7.3L Ford diesel
Answer: I believe it is safe...a lot of people go for the Cat EC1 rating which will be the Rotella ELC...the nitrite free version is dialed toward newer diesels with lots of aluminum, and resists hot spot boiling in places like EGR coolers. If you do a full flush and make sure there is no remaining old coolant this NF should do you good.
Question: Is this concentrate or
Answer: Concentrate
Question: What is the recommended dilution rate
Answer: 50/50. One gallon distilled water one gallon ELC will give you 2 gallons antifreeze/coolant.
Question: Is it safe to mix this with the regular rotella ELC
Answer: This product is mixable with other ELC type coolants. However, diluting/mixing with other non-equivalent coolants can reduce/eliminate the extended life properties of this coolant.

Zerex Asian Vehicle Blue Silicate and Borate Free 50/50 Prediluted Ready-to-Use Antifreeze/Coolant 1 GA

Zerex

Based on 481 reviews Check latest price

Product description

ZEREX™ Asian Vehicle Antifreeze/Coolant is specifically formulated to meet the requirements of Asian vehicle manufacturers (Honda®, Nissan®, KIA®, Hyundai® and others) requiring a blue, silicate free Hybrid Organic Acid Technology (HOAT) with a phosphate additive. This patented formula is designed to replace the original fluid and provides protection from rust, corrosion, boil overs and freezing.

  • 5 year/150, 000 mile . Silicate-free, long-life, phosphate Hybrid Organic Acid Technology chemistry
  • Formulated to replace the OEM fluid in Asian make vehicles such as Honda, Nissan, KIA, Hyundai and others requiring a blue, silicate free HOAT antifreeze/coolant
  • The long life formula provides protection for all cooling system metals from rust and corrosion. The silicate free, borate free formula helps protect against harmful scale and deposits
  • Meets the following OEM and industry specifications: Hyundai/KIA MS 591-08, Mitsubishi ES-64217, JIS K 2234-1994, Ford WSS-M97B55-A, ASTM 3306, ASTM D4985, Federal Specification A-A-870A
  • Contains 30 – 50 ppm of denatonium benzoate as a bittering agent

User questions & answers

Question: Can this be mied with the basic green coolant
Answer: The Valvoline - 861398 Zerex Asian Vehicle Blue Silicate and Borate Free 50/50 Prediluted Ready-to-Use is not recommended to mix with Original Green coolant.
Question: Is this the same as Honda Type 2 blue coolant? I am currently using prestone green coolant but my car overheats
Answer: Yes, the Zerex Asian Vehicle Blue Silicate and Borate Free 50/50 Prediluted Ready-to-Use Antifreeze/Coolant is suitable to use in place of the Honda Type 2 coolant.
Question: Can i mix this with mazda's fl22 coolant
Answer: Yes, the Valvoline - 861398 Zerex Asian Vehicle Blue Silicate and Borate Free 50/50 Prediluted Ready-to-Use is suitable for use as a top off or full fluid replacement with the Mazda FL22 coolant.
Question: Does anyone know the difference between the blue and the red coolant of this kind
Answer: The only difference between the Zerex Asian Blue Coolant and the Zerex Asian Red is the dye package used post production. We make the two different colors simply just to match the OEM coolant color for different manufacturers.

Product features

Zerex Asian Vehicle Blue Silicate and Borate Free 50/50 Prediluted Ready-to-Use Antifreeze/Coolant 1 GA

ZEREX Asian Vehicle has been designed to meet the requirements of Asian manufacturers, which specify a silicate free HOAT formula with a phosphate additive to protect their cooling systems from rust and corrosion. Available in both red and blue formulas to better match your Asian vehicle’s specific requirements.

Features

Valvoline ZEREX Asian Vehicle Antifreeze / Coolant has been designed to meet the requirements of Asian auto manufacturers. Additional product benefits include:

  • Premixed with demineralized water for added protection and convenience
  • Compatible with Asian vehicle coolants and cooling systems
  • Protects against freeze-ups and boilovers

K-SEAL Coolant Leak Repair ST5516 Heavy Duty 16oz, Multi-Purpose Formula for Truck/Tractor Coolant Leaks in the Radiator, Head Gasket, Water Pump Casing & Heater Core, A True Pour & Go -Trade Trusted

K-Seal

Based on 524 reviews Check latest price

Product description

K-Seal 8 fluid ounce bottle is effective to 20 quarts cooling capacity. Just shake, pour and go. It repairs leaks and cracks in radiator, head gasket, heater core, freeze plugs, water pump casing, cylinder heads and engine blocks. For truck, tractor, industrial, RV and large capacity engines.

  • REPAIRS IN MINUTES: Create a permanent weld within the entire coolant system, including on hard plastic radiators and aluminum heads and blocks in larger capacity engines, AG, RV etc. The only industrial coolant sealant university tested to meet ASTM D3147.
  • SEALS CRACKS AND STOPS LEAKS: Avoid expensive downtime, our coolant stop leak will permanently seal cracks and holes! Quickly repair your head gasket, block, leaking radiator, freeze plug, heater core & water pump casing with no adverse impact on efficiency.
  • POUR AND GO: Our cooling system sealer is easy to use just shake the bottle, add to your radiator/overflow and run the engine! Unlike some competitive products, it mixes with all types of antifreeze, no draining, flushing or pulling the thermostat required.
  • SCIENTIFICALLY TESTED: Safe and effective, our Heavy Duty Coolant stop leak repair seals leaks up to 1/32 of an inch! Once cured, it withstands the high pressure of the combustion chamber, without failing or clogging the cooling system. US Bestseller
  • CUSTOMER SUPPORT: If our engine coolant leak doesn’t seal your head gasket, the system might be over-pressurized. Check the Technical Specification section of this page for extra instructions for a successful repair. Over 8 million bottles sold. Save time/money

User questions & answers

Question: Tried using alumaseal, which isn't working. will i need to flush the system before using the k-seal
Answer: I used the HD Truck bottle on my 1998 GEO Tracker ( used 1/3 of the bottle ) of K-Seal and it worked. I have used so many to no avail. To answer your question, I must have @ least 3 to 4 other sealers in my colling system when I added K-Seal. It's been almost a year & no adverse effects having not flushed my radiator. Should I have flushed the radiator & the system? Yes, I should have.
Question: Will this work with aluminum heads
Answer: It works equally well with cast iron or aluminum. Great Stuff. Not a long-term solution, but it will buy you a lot of time.
Question: how much do i need to pour in a diesel 1 ton cummins
Answer: You need this one bottle for a Dodge 3500 hd. I have this one bottle in my HD Freightliner 330hp MBZ engine hauling freight (54,000 lbs cap) 6 days a week and it stopped my coolant leak in the engine bay and heater core with no blockage and no. My opinion, Many reviews say products dont work BECAUSE most people dont take care of their equipment and their vehicles are old, high mileage and no maintenance done. None of the add to a tank products are as good as replacing with new parts but thats expensive, we get it. This may or may not fix your problem but its a low cost gamble with a high probability of success. Dont listen to the negative reviews. If the problem comes back, your damage was too far gone and in need of replacement anyway.
Question: Does it work on potentially warped heads
Answer: Probably not, but read on, and learn about all coolant leak problems if you want and how effective this product is....This bottle is enough for up to 12 cylinder engines.This will work for any type of coolant leak, if the leak is small. This will work on head gasket leaks also, read this 3 minute read on what to do if its a head gasket leak. Also, for for your information - This is "liquid glass" that dries rock hard and will seal your head gasket leak (its been used in farm equipment for over 75 years and is WELL proven to work, and it was discovered over a hundred years ago), but you MUST perform a simple test. Okay, start your vehicle, let it idle for 45 minutes straight. If the temperature gauge does not indicate that your engine is overheating, then this product will most likely work. No overheating at an idle for 45 minutes MEANS that the head gasket leak is still small enough to be filled by this liquid glass. Shake the container for 30 seconds, put the liquid in your COOLANT system, drive for an hour (or other words, operate at normal temperature, especially if its an aluminum block with cast iron heads), and then let it sit for 24-48 hours (the longest time is better). This sitting time allows the liquid glass to harden completely through. If it overheats then, it most likely its a thermostat or water pump or heater core or lower radiator hose sucking shut under load (sometimes the upper one also) or radiator or radiator fan or leaking core plug or leaking coolant storage unit OR your ENGINE OIL is very low from leaking (completely different problem that has nothing to do with the coolant system, but much to do with the cooling of the engine also) or heat indicator gauge or it still could be a blown head gasket, because the hole is just too big for the sealant to seal it up OR the head gasket BLOWS in another area after you have sealed up the first hole with the coolant sealant you added (that's why you should add it three times three different bottles of liquid glass over three months as I will mention below, that way, if it does blow in another area you will most likely SEAL that area also). But buy this and try it even if your vehicle fails the 45 minute test after 10 minutes. Sometimes, it will still seal the leak, or at least slow it down. Also, you can add this once a month for three months, and maybe that will work also (this gives you a month to see how the car performs under various conditions, and for the reason I just mentioned above). If you need the car to last for just a short while (month to six months) this can be a quick fix to hold you over until you can sell the car (under buyer be where conditions) or get it to the shop when you have the money. $15 and a few minutes of your time OR the mechanic, you have to decide. Good luck. I'm a retired mechanic with two degrees in Diesel mechanics and I ran a shop for a year.... :)

Product features

Permanent Coolant Leak Repair with K-Seal

Coolant leaks don’t have to result in costly repair bills – simply add K-Seal to your coolant system for a quick and permanent fix. K-Seal is trusted by millions of customers worldwide, and the only coolant leak repair fluid carried by the AA, the UK’s largest roadside repair company.

K-Seal’s unique formula will seek out holes and cracks, and permanently seal them, with no adverse impact on the efficiency of your engine cooling.

Coolant System Sealer

Once the crack or hole has been located, the microfibers instantly begin to mesh together within the gap, building a seal literally fiber by fiber to stop the coolant leaking through the gap.

The particles in our K-Seal products are very precisely designed to be large enough to repair holes up to 0.635mm in size but deliberately small enough to never block any passageways or tubes within the cooling system, including those inside the heater core and radiator.

Once the microfibers have sealed and fixed the leak, a combination of exposure to either the external atmosphere or the gases within the combustion chamber and the heat within the cooling system and engine causes the K-Seal formula to cure. This results in an extremely strong and permanent seal able to withstand even the high pressures from the combustion chamber. K-Seal Ultimate is able to repair head gasket failures, even where the cooling system is being over-pressurised by exhaust gases entering the system.

Common Coolant Leaks

K-Seal can deal with all of these leaks and more, as long as they are identified as early as possible. It is easy to use – simply shake it and pour it into the coolant mixture and it will work automatically.

Zerex Asian Vehicle Red Silicate and Borate Free 50/50 Prediluted Ready-to-Use Antifreeze/Coolant 1 GA

Zerex

Based on 1 reviews Check latest price

Product description

ZEREX Asian Vehicle Antifreeze/Coolant is specifically formulated to meet the requirements of Asian vehicle manufacturers (Toyota , Lexus , Scion and others) requiring a red, silicate free Hybrid Organic Acid Technology (HOAT) with a phosphate additive. This patented formula is designed to replace the original fluid and provides protection from rust, corrosion, boil overs and freezing.Note: Please check the vehicle specification before purchasing the item.

  • Formulated to replace the OEM fluid in Asian make vehicles such as Toyota , Lexus , Scion and others requiring a red, silicate free HOAT antifreeze/coolant
  • 5 year/150, 000 mile . Silicate-free, long-life, phosphate Hybrid Organic Acid Technology chemistry
  • The long life formula provides protection for all cooling system metals from rust and corrosion. The silicate free, borate free formula helps protect against harmful scale and deposits
  • Meets the following OEM and industry specifications: JIS K 2234-1994, Hyundai/KIA MS 591-08, Mitsubishi ES-64217, Ford WSS-M97B55-A, ASTM 3306, ASTM D4985, Federal Specification A-A-870A
  • Note: Please check the vehicle specification before purchasing the item.

User questions & answers

Question: i intend buying 8 gals to africa. my toyoyta sequoia 2008 needs 4 and i need 4 as reserve. what is the shelf life of this product if un opened
Answer: The manufacturer's product information page states a 5 year shelf life for this product.
Question: So my coolant is about to hit low and going to add some of this can i mix this with pink coolant? pretty sure the pink comes from oem
Answer: Using this to top off pink/red coolant will be fine, I've used this to replace the coolant in my 05 Solara and to top off my 17 Camry. Most of the long life coolants are basically the same however there are some you shouldn't mix anything else with like GM's Dexcool.
Question: Does this coolant contain 2-EHA (2-ethylhexanoic acid
Answer: Ingredient label says: "Ethylene Glycol (107-21-1), Water (7732-18-5), Diethylene Glycol (111-46-6), Sodium Benzoate (532-32-1), Corrosion Inhibitors, Defoamers, Dye, and Bittering Agent"
Question: is it safe for honda odyssey
Answer: Old question, but the Zerex stuff (and Wal Mart's Valvoline Asian) as both red. Honda uses Type 2 blue coolant. It would probably work, but I wouldn't want to mix colors. Either get the OEM Honda stuff which is around $22 a gallon now, or you can go generic and buy the blue stuff from Pentosin (Pentosin Pentofrost A3). The Pentosin is the closest thing to OEM Honda coolant you can get.

Product features

Zerex Asian Vehicle Red Silicate and Borate Free 50/50 Prediluted Ready-to-Use Antifreeze/Coolant 1 GA

ZEREX Asian Vehicle has been designed to meet the requirements of Asian manufacturers, which specify a silicate free HOAT formula with a phosphate additive to protect their cooling systems from rust and corrosion. Available in both red and blue formulas to better match your Asian vehicle’s specific requirements.

Features

Valvoline ZEREX Asian Vehicle Antifreeze / Coolant has been designed to meet the requirements of Asian auto manufacturers. Additional product benefits include:

  • Premixed with demineralized water for added protection and convenience
  • Compatible with Asian vehicle coolants and cooling systems
  • Protects against freeze-ups and boilovers

Honda Genuine COOLANT (Type-2) (OL999-9011)

Honda

Based on 1 reviews Check latest price

Product description

GET ON THE WATER

  • Extended life formulation 5 years/60,000 miles
  • Better cooling performance
  • Performance under extreme operating conditions -34º to 228ºF
  • Pre-mixed DO NOT add water
  • Contains NO silcate and borates

User questions & answers

Question: Should i mixed with water
Answer: Do not add water this is an already mixed item
Question: How much does it cost at the dealer
Answer: I got mine from the dealer for $20. Generally the dealer has always been cheaper for me when buying oil and filters.
Question: Does it contain silcates
Answer: No Silcates in the OEM brand of Honda
Question: I live in the upper 48 , how cold of temperature can you use this in without it freezing
Answer: If you install it as from the container it is already 50/50 mix which is good to -34 F.

MaxLife Valvoline Multi-Vehicle Antifreeze/Coolant 1 GA

MaxLife

Based on 41 reviews Check latest price

Product description

Valvoline MaxLife Antifreeze/Coolant helps extend the life of higher mileage vehicles by keeping your vehicle's engine temperature stable in all climates and driving conditions by transferring heat from the engine to the radiator. Over 60% of today’s vehicles on the road contain antifreeze with silicate. The leading antifreeze brands claiming “all makes, all models” use a corrosion inhibitor package without silicate. These chemistries, when mixed together, may fail to protect the cooling system from rust and corrosion. MaxLife Antifreeze is the only antifreeze to contain Alugard Plus, a special additive that allows these chemistries to work together to provide maximum protection.

  • Recommended for use in all makes, all models, all mileages and compatible with all colors
  • Only antifreeze to contain Alugard Plus, a special additive that allows these chemistries to work together to provide maximum protection
  • Lubricates gaskets and seals
  • Helps protect against cold weather freeze-ups and hot weather boil-overs
  • Contains 30 – 50 ppm of denatonium benzoate as a bittering agent

User questions & answers

Question: I believe valvoline replaced our coolant with this in yellow. chrysler recommends hoat 5 year 100,000 mile. would using this be ok
Answer: I have had it in my 2005 Durango 4.7 for 2 years now with no issues. Truck runs cooler than before.
Question: More than 50/50% won't transfer heat as well. Less concentrate will not prevent corrosion properly. This is aside from temp issues w/freeze/boil
Answer: Estimate the minimum temperature your car will see and then use the chart at http://www.valvoline.com/pdf/Valvoline_MaxLife_AFC_Technical_Bulletin.pdf to determine the concentration needed to prevent freezing at that temperature. I would be more concerned with freezing your block than reduced heat transfer. To some extent, your car's cooling system will compensate for the compromised heat transfer properties of a higher concentration.
Question: Is this the concentrate or is this the 50 / 50 premix
Answer: it is the concentrate
Question: How wide is the mouth of the container
Answer: About the same as a regular antifreeze gallon container

BMW 82141467704 Grey Antifreeze Coolant - 1 Gallon

BMW

Based on 948 reviews Check latest price

Product description

To give automotive engine and cooling system year round protection against corrosion, boil overs and heat damage.

  • 1 Gallon bottle
  • Never remove the radiator or expansion tank cap from a hot engine
  • Ethylene glycol-based
  • Provides protection for metals such as cast iron, steel and aluminum
  • Contains Bittering agent

User questions & answers

Question: Can this be used for a 2009 328i
Answer: According to FCP website this fits your car, this is pretty much the standard coolant/antifreeze for most of the BMW cars I know of. I used it on my 2001 M3 and 2005 325ciIf you are doing a complete coolant flush/replacement on your car, then you need to get one jar of this and mix it in a bucket with another 1 Gallon jar of Purified Water (sold in any convenience store,purified water only, not spring water)
Question: Does this coolant need to be diluted or used directly "as is"? If it should be diluted what's the best ratio with water
Answer: Diluted using DISTILLED water. 50/50 is a safe ratio. I've heard some guys running 70/30 but I've been running 50/50 for years with no problems.
Question: I am familiar with the traditional BLUE coolant used by BMW. The title of this product says GREY. Is this in reference to the color of the fluid
Answer: The container is Grey, I have purchased this item. The coolant color is BMW Blue, not sure why the description says Grey...
Question: is it pet friendly
Answer: It is still toxic, but my understanding is that BMW adds a "embittering agent" that makes it taste bad to some/most pets.

Zerex Original Green 50/50 Prediluted Ready-to-Use Antifreeze/Coolant 1 GA

Zerex

Based on 906 reviews Check latest price

Product description

ZEREX™ Original Green provides superior cooling system protection for passenger, light duty and heavy duty vehicles. Used for decades by many automakers worldwide, the formula provides excellent corrosion and freeze protection.

  • Provides protection down to -34 degree fahrenheit
  • Helps prevent rust and corrosion
  • A patented organic acid corrosion inhibitor package to provide extended engine protection against rust and corrosion
  • Contains 30 – 50 ppm of denatonium benzoate as a bittering agent

User questions & answers

Question: What is the bittering agent used for
Answer: The bittering agent is used to help make this product taste bad so children and animals do not drink it.
Question: Can I use this on a 2010 Ford Taurus
Answer: Unfortunately, this product is not suitable for use in your Taurus. We suggest using the Zerex G-05 Antifreeze/coolant for all 04 - 2011 Ford passenger cars.
Question: Will this work with my 1993 murcury villager gs
Answer: Yes, the Zerex ZXRU1 Original Green 50/50 Prediluted Ready-to-Use Antifreeze/Coolant is suitable for use in your Mercury Villager.
Question: Will this antifreeze be good for a 2005 Altima
Answer: you have to know what cind of antifreeze it takes

Product features

Zerex Original Green 50/50 Prediluted Ready-to-Use Antifreeze/Coolant 1 GA

ZEREX Original Green provides superior cooling system protection for passenger, light-duty & heavy duty vehicles. Used for decades by many automakers worldwide, the formula provides excellent corrosion and freeze protection.

Features

Valvoline ZEREX Original Green Antifreeze / Coolant provides:

  • Low-silicate chemistry for heavy-duty applications with use of SCA
  • Corrosion inhibitor package provides rust and corrosion protection
  • Helps prevent boil-overs and freeze-ups
  • Use in vehicles that specify traditional green coolant

Genuine Subaru SOA868V9270 Super Coolant

Genuine Subaru

Based on 654 reviews Check latest price

Product description

Formulated for long-lasting corrosion and rust protection for all cooling system components, this prediluted antifreeze/engine coolant prevents the use of poor quality water that can lead to cooling system failure.

  • Provides cold-weather protection to -62 Degree F
  • Protects against corrosion with organic corrosion inhibitor
  • Eliminates need for additional corrosion inhibitors
  • Compatible with non-metal surfaces
  • Required for use in all warranty repairs

User questions & answers

Question: I have a 2016 crosstrek, do I just top off
Answer: I would just add to the full mark.
Question: can you top off with alittle water
Answer: You absolutely can, and typically SHOULD top off with distilled or DI water once the vehicle has a few thousand miles on it (enough time to be sure all the air is out of the cooling system). It's normal to lose water from the mix over time, but the exact amount will depend on your specific driving conditions. The only time I would top off with fresh coolant would be if I noticed a sudden drop in level or some other sign of leaking antifreeze.
Question: How is this different from regular, old Prestone ethyl glycol ? Why does it cost three times as much? Just because it's blue
Answer: Subaru flat fours are notorious for head gaskets leaks. The head gasket, among other things, provides a barrier between the cylinder and the cooling system. Since the engine is flat, the bottom of the heads are basically living in coolant which may lead to gasket deterioration. I've heard that Subaru devised their Super Coolant to help preserve those gaskets and prevent leaks. For that reason I use the Subaru coolant and change it every 50,000 miles. I don't do that with our "normal" cars.
Question: whats the difference between the "long life" coolant and this "super coolant
Answer: hello the long life coolant is green, super coolant is blue and the 2 should not be mixed

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