13 best gasoline stabilizers

Gasoline stabilizers are additives designed to prolong the shelf life of gasoline and prevent it from degrading over time. When gasoline is stored for an extended period, it can undergo chemical changes, leading to varnish, gum, and other deposits that can clog fuel lines and injectors in engines.Gasoline stabilizers help to counter these effects, ensuring that the fuel remains fresh and usable even after prolonged storage.

These stabilizers typically work by inhibiting the oxidation process, which is a major factor in gasoline degradation. Oxidation occurs when gasoline is exposed to air, leading to the formation of harmful compounds. Gasoline stabilizers contain antioxidants and corrosion inhibitors that prevent oxidation and the formation of gum and varnish.

Here are some key points about gasoline stabilizers:

  1. Preventing Fuel Degradation: Gasoline stabilizers prevent the formation of varnish and gum, which can clog fuel systems and lead to engine damage.

  2. Corrosion Protection: Stabilizers often contain corrosion inhibitors that protect metal components in the fuel system from rust and corrosion.

  3. Ethanol Treatment: Many stabilizers are formulated to combat the negative effects of ethanol in gasoline. Ethanol can attract moisture, leading to phase separation and engine issues. Stabilizers with ethanol treatment components can mitigate these problems.

  4. Easy to Use: Gasoline stabilizers are typically easy to use; you simply pour the recommended amount into the fuel tank before storing the vehicle or equipment.

  5. Benefits for Seasonal Equipment: Gasoline stabilizers are particularly useful for seasonal equipment like lawnmowers, snow blowers, boats, and motorcycles, which may be stored for several months without use.

  6. Fuel System Cleaning: Some stabilizers also have cleaning properties, helping to remove existing deposits from the fuel system and improve engine performance.

  7. Long-Term Storage: Gasoline stabilizers are essential for long-term storage situations, where fuel might be stored for more than a month or two. They help maintain fuel quality, ensuring the engine starts and runs smoothly when the equipment is taken out of storage.

It's important to follow the manufacturer's instructions regarding the proper dosage of stabilizer for the volume of gasoline you are treating. Using too little may not provide adequate protection, while using too much could lead to unnecessary expenses.

In summary, gasoline stabilizers are valuable additives for maintaining the quality of stored gasoline, preventing engine issues, and ensuring the reliable performance of vehicles and equipment, especially during periods of infrequent use.

Below you can find our editor's choice of the best gasoline stabilizers on the market
  

STA-BIL Storage Fuel Stabilizer - Guaranteed To Keep Fuel Fresh Fuel Up To Two Years - Effective In All Gasoline Including All Ethanol Blended Fuels - For Quick, Easy Starts, 16 fl. oz. (22207)

STA-BIL

Based on 2 reviews Check latest price

Product description

Storing fuel for more than a year? Have a generator or piece of equipment you don’t know the next time you will use it? Have no worries STA-BIL Storage is an additive meant just for what you’re looking for. STA-BIL Storage keeps gas fresh for up to 24 months. This eliminates the need to drain fuel before storing your equipment and ensures quick easy starts the next time you go to fire it up. This product is highly effective in all gasoline including ethanol and non-ethanol blended fuels. Whether using 87, 91, or 93 octane gas ethanol or non-ethanol blended gas still goes bad. This product is great for bulk gas storage as well as collector cars, small engines, generators, and boats. Treat rate is 1oz to 2 ½ gallons of gas. If using with small engine equipment it is best to add STA-BIL Storage to your gas can. This way every piece of equipment you fill with that can is treated. Make sure to add STA-BIL while the gas is fresh. Best practice is to add STA-BIL when you are at the pump. STA-BIL is proudly made in the USA.

  • Keeps fuel fresh for up to 24 months during storage
  • Eliminates need to drain fuel prior to storage
  • Ensures quick, easy starts after storage
  • Effective in all gasoline, including ethanol blends
  • For all gasoline engines, including 2-cycle
  • Fit type: Universal Fit

User questions & answers

Question: can it be used after gas has sat in a tank for years of none use or is it to late to use
Answer: The best way to use it is to do it right when you store a vehicle. You should probably drain the gas and start fresh if you have been sitting for years.
Question: Can i put sta-bill in a 300 gallon tank that is already full of gas? i have no way to agitate it once i add the sta-bill
Answer: Yes. You can simply add the recommended amount to the fuel. Shaking, mixing, or agitating is not necessary, as STA-BIL Storage will dilute itself into the fuel. Hope that helps. If there are any questions, please feel free to contact us at [email protected]. Thanks for the question!
Question: I have stored gas in gas cans for about a year and a half wheel this product be good for the situation
Answer: Ron, you must use Sta-bil before you store the gas. It will keep gas fresh for one year. If you double the dosage it will work for two years.
Question: Can this be used year round, even while running the mower
Answer: Hi. Thanks for the question. Yes, you can certainly use STA-BIL all year-round as it does help in keeping the fuel system clean and the fuel as fresh as possible while in use. If there are any questions, please feel free to contact us at [email protected].

Product features

STA-BIL Storage Fuel Stabilizer

Store fuel for more than a year? Have a generator or piece of equipment that you aren't sure when it'll get used again? Have no worries because STA-BIL Storage is an additive for all of those uses. STA-BIL Storage keeps gas fresh for up to 24 months. This eliminates the need to drain fuel before storing your equipment and ensures quick easy starts the next time you go to start your engine. This product is highly effective in all gas including ethanol and non-ethanol blended fuels. Whether using 87, 91, or 93 octane gas ethanol or non-ethanol blended gas still goes bad. This product is great for bulk gas storage as well as collector cars, small engines, generators, & boats. Treat rate is 1oz to 2½ gallons of gas. If using with small engine equipment it is best to add STA-BIL Storage to your gas can. This way every piece of equipment you fill with that can is treated. Make sure to add STA-BIL while the gas is fresh. Best practice is to add STA-BIL when you are at the pump.

Star Tron Enzyme Fuel Treatment Concentrate - Rejuvenate & Stabilize Old Gasoline, Cure Ethanol Problems, Improve MPG, Reduce Emissions, Increase Horsepower

Star brite

Based on 1 reviews Check latest price
  • Cures and prevents ethanol fuel problems; helps prevent phase separation
  • For everyday use and seasonal storage; stabilizes fuel for up to 2 years and can help rejuvenate old, sub-spec fuel
  • Makes engines start easily and run smoothly; improves fuel economy and reduces emissions
  • Cleans valves and injectors of carbon deposits, gums and varnish for maximum performance, increased fuel efficiency and reduced emissions
  • Concentrated formula #930XX is economical to use in large and small applications; safe for use in all engines (including 2-cycle pre-mix)

User questions & answers

Question: Will star-tron enzyme damage zinc-alloyed vintage bmw motorcycle engines from
Answer: Star tron is perfectly safe for your BMW motorcycle engine.
Question: Will this refresh gasoline that has sat for 3 years? thanks
Answer: I don't know if it will "refresh" gasoline that old. It should reduce some of the "gummy" deposits that form in older gas. I once used this successfully to unclog the fuel jets on an outboard motor by simply pouring a fairly high concentration of it into the fuel tank and letting it sit a few days. However, three years is a long time for gas to sit if it wasn't already mixed with a good fuel stabilizer all that time. If you mix this stuff with fresh gas, I would definitely feel comfortable using that gas 1 to 2 years later (and have done so in my lawn mower), expecting good results.
Question: Should I add this to gas cans in storage
Answer: Yes, that way the fuel is stabilized during storage and is pre-treated so it can be added directly to the fuel tank of the engine being fueled.
Question: Can this be added to fuel that already has Sta-Bil in it
Answer: Yes.

Product features

Star Tron Enzyme Fuel Treatment - Concentrated Marine Formula - Gasoline

Star Tron Enzyme Fuel Treatment is a multifunctional fuel additive which uses a unique enzyme technology. Helps all engines start easily and run smoothly, even when using ethanol-blended fuel or after sitting idle for months.

Cures and prevents ethanol fuel problems. Star Tron breaks down excess water and sludge to sub-micron size, allowing it to be safely burned away during normal engine operation which helps prevent phase separation.

Increases fuel economy by cleaning the entire fuel delivery system, removing performance robbing gum and varnish deposits while modifying how fuel burns. This results in more complete and uniform combustion, maximum performance, increased fuel efficiency, reduced emissions, and reliable operation.

Stabilize fuel for up to two years, preventing the formation of gums and other solids that clog carburetors and fuel injectors. Star Tron can help rejuvenate old and sub-spec fuel.

Recommended Uses

Star Tron can be used in all gas outboards, inboards, cars, trucks, motorcycles, ATVS, snowmobiles, small engines, outdoor power equipment including pre-mix fuel engines. Star Tron is safe for all engines, will not harm oxygen sensors, and overdosing is not harmful.

Directions

Initial Dosage: Add 1 fl. oz. (30 ml) for every 8 gallons (30 L) of gas.

Refill: Add 1 fl. oz. (30 ml) for every 16 gallons (60 L) of gas.

Overdosing is not harmful.

Stabilizes Fuel

Stabilizes gas for up to 2 years and helps rejuvenate old, sub-spec fuel.

Disperses Water

Helps prevent phase separation by dispersing water into submircron-sized droplets.

Removes Gum & Carbon Deposits

To keep engines running clean and strong.

Enhances Combustion

For complete fuel burn for maximum power & fuel efficiency.

K100 MG Gasoline Treatment with Stabilizer - 12/8 oz. case

K100

Based on 47 reviews Check latest price

Product description

K100 MG - Make Water Burn K100 MG Gasoline Treatment with Enhanced Stabilizers is a proprietary formulation of complex organic compounds developed primarily to eliminate moisture contamination in Gasoline, with additives to improve the cleaning effect and cold temperature operation, increase lubricity and shelf-life of the fuel, and modify the fuel itself to increase atomization and improve the fuel/energy conversion process. K100 G Gasoline Treatment helps eliminate the water issues associated with using Ethanol Blended Fuels. E-10 gasoline absorbs moisture from the air and if enough water is present will phase separate. 40-80% of the ethanol will be drawn away from the gasoline, forming two distinct layers. The top layer is gasoline with a lower octane, while the bottom layer is a mix of water and ethanol that will not burn. This may ruin the carburetor or injector pumps and make an engine difficult or impossible to start. In a 10% ethanol blend, 18 gallons of water in a 6,000 gallon tank can cause phase separation. K100’s unique bio-based (green) chemistry eliminates all free water, which eliminates all water-related problems including microbe growth in diesel and bio-diesel fuels and phase separation in E-10. K100 encapsulates water - ounce for ounce, gallon for gallon - and makes it burn. Used regularly, K100 upgrades fuel quality and promotes more complete combustion for reduced emissions, better mileage, easier starts, smoother idle, more power and faster acceleration. K100 MG Gasoline Treatment with Enhanced Stabilizers also CLEANS! K100 Treatments modify the petroleum molecule, altering the burn chemistry for more complete combustion which results in more power, better mileage and a cleaner environment. K100 MG Gasoline Treatment with Enhanced Stabilizers SAVES MONEY!

  • Eliminates water and water-related problems,
  • Prevent and/or rectify Fuel Phase Separation
  • Improves engine efficiency for more miles/gallon/hour
  • Eliminates freeze-ups that block fuel lines and filters
  • Eliminates free water for easier starting, smoother idle, more power, better acceleration

User questions & answers

Question: Is this the new mg+ formula
Answer: Yes, at least. This is an old company that has been around a loooong time. Their lighters are always my first choice.
Question: How many bottles in this package
Answer: It's triple filtered

Lucas Oil 10314 Fuel Stabilizer - 8 oz.

Lucas Oil

Based on 282 reviews Check latest price

Product description

A better solution to prevent gasoline break-down during storage. Safe to use in all grades of gasoline and in all 2 and 4-cycle engines. Easy to use. Application rate: 1 pound to treat 1 gallon.

  • Better solution to prevent gasoline break-down during storage
  • Safe to use in all grades of gasoline and in all 2 and 4-cycle engines
  • Easy to use
  • Application rate, 1 pound to treat 1 gallon

User questions & answers

Question: What is it's shelf life
Answer: There's nothing on the bottle that states use by. So best guess is no.
Question: Will this work for generators
Answer: Just as it says on the Lucas website, it is for ALL 2 and 4 stroke engines. And I have used it in all of mine, including my emergency power generator, which gets run only once or twice a year. It has always performed perfectly for me. Of course whenever possible, the very best fuel for small engines, -especially 2 stroke, is "fresh, high octane, with no alcohol." But my emergency power generator sits for many months at a time between uses, so I keep the tank full of no-alcohol premium fuel, treated with Lucas. Hope this helps you.
Question: how much fuel stabilizer is needed for 5 gallons of gas
Answer: 5 oz. It's 1 oz per gallon
Question: Description says 1 pound per gallon sounds wring
Answer: e ounce per gallon actually in tank

PRI Fuel Stabilizer - Gasoline, 16 Ounce- Fuel Economy Booster

Based on 230 reviews Check latest price

Product description

CONTAINS: 16 oz

  • pri

User questions & answers

Question: Can the gas being treated be used in a 1968 straight 6 cylinder chevy pickup
Answer: This has a proprietary formulation "MG" for preventing water accumulating in the gasoline tank. Water is heavier than gasoline so when condensation forms inside the top part of a tank especially in humid weather...the water flows down to the bottom of the tank. Ethanol is a bad idea for creating fuel from corn just to please the ignorant representatives in Congress....consequently we are the victims of their greed and stupidity as we pay high prices for unnecessary engine repair. So what needs to be done to prevent ethanol-water from destroying perfectly good running engines is a chemical make the water mix with the gasoline in a extremely-diluted mix so when the fuel is burned/ignited the water molecules blast through the combustion also then out the exhaust. I do not know of any "+" with the MG formula which is an excellent product.
Question: will this help my gas in car that has been sitting a year
Answer: 12 bottles.
Question: Does this product mix well with two cycle oil for outboard engines ? does it remove water? is it alcohol free
Answer: Yes. Press the button to light fire, turn the safety lock clockwise at the same time, will keep firing without your pressing.
Question: What is the difference between "Stabilizer" and "Treatment
Answer: Yes, however it is well made and works as advertised.

John Deere Fuel-Protect Gasoline Stabilizer TY27534

Based on 70 reviews Check latest price

Product description

*Not available for sale to Alaska or Hawaii*   John Deere Fuel Protect Gasoline Stabilizer is a unique formula developed to ensure optimum performance and protection year round. John Deere Fuel Protect Gasoline Stabilizer has Corrosion Preventers and comes from the makers of Sta-Bil. We are adding to the Fuel Protect family of fuel treatment solutions from John Deere. This one is for Gasoline

Whether its for lawn and garden equipment, collectors cars, or your everyday driver, John Deere Fuel Protect Gasoline Stabilizer ensures quick starts in all 2 and 4 cycle engines. Use in gasoline, gasoline/oil mixture, and ethanol blends. Use to treat gas cans at each fill-up, or use at every fill-up in all your vehicles.

Includes Corrosion Preventers

Blended fuel attracts water from the air, which causes corrosion to fuel tanks, fuel lines, carburetors and injectors. John Deere Fuel Protect contains double the corrosion preventer to help fight these damaging affects to internal components thus eliminating down time and costly repairs.

Keeps Fuel Fresh

Pumped gasoline starts to degrade immediately causing varnish deposits to build in engines resulting in starting problems, poor performance and reduced engine life, Adding John Deere Fuel Protect keeps fuel fresh for 12months, more than doubling the storage life of fresh gasoline. John Deere Fuel Protect eliminates the need to drain

Improved Performance

John Deere Fuel Protect contains a fuel injector and carburetor cleaner to prevent deposits build-up and maintain engine performance. Its ability to prolong fuel freshness prevents the creation of varnish thus eliminating buildup and the negative affect it has on engine performance

Dosage and Usage 1 ounce treats 2 gallons. For use at every fill up, use 2.5 ounce in 5 gallons. For best results, treat fuel promptly when purchased. For extended storage (up to two years) uses double th...

User questions & answers

Question: How many gallons of fuel will this treat
Answer: Stabilizer keeps gas fresh longer. Treatment is for cleaning out fuel systems.

6161 Marine Fuel Stabilizer - Gasoline, 8 Fl Oz (CRC)

CRC

Product description

TREATS 40 GALLONS A concentrated, high-potency formula that keeps stored gas fresh for easy start-up next season & optimum performance year round. Prevents harmful fuel separation caused by Ethanol-blended gasoline. Protects against gum & resin build-up. All 2 and 4 cycle gasoline engines, marine engines, agricultural equipment, lawn & garden equipment, chainsaws, generators, jet skis, lawn mowers, motorcycles, snow blowers, snowmobiles, tractors

2 PACK of 16 oz. PRI-G Fuel Stabilizer- Gasoline

Based on 21 reviews Check latest price

Product description

2 PACK of 16 oz. PRI-G Fuel Stabilizer- Gasoline

  • PRI

STA-BIL Gasoline Treatment Additive Fluid Fuel Stabilizer, 1 Gallon (2 Pack)

STA-BIL

Based on 2 reviews Check latest price

Product description

The simple fact is that gas is perishable. In fact, it can start going bad in as little as 60 days. If you're storing your vehicle long-term or putting away your lawn mower or snow blower for the season, that can mean a dead engine the next time you try to start it up. Fortunately, with STA-BIL Gasoline Additive Fuel Stabilizer, you can easily preserve your gasoline for up to 24 months. STA-BIL Storage Fuel Stabilizer keeps ethnanol and non-ethanol gasoline fresh for quick starts after periods of storage. It also removes water, prevents corrosion, and cleanses carburetors and fuel injectors. 1 ounce treats up to 2.5 gallons of fuel. Use it in all engine types you're storing for 30 days or longer. It lasts up to 24 months and works in vehicles, motorcycles, small engines, generators, boats, and more. Run your engine for 5 minutes after adding to treat the entire fuel system too. You don't need to drain fuel out of your 2- or 4-cycle engine any more. Just add stabilizer to prevent gum and varnish build-up and protect your engine for the long haul. The next time you go to start it up, you'll be glad you did.

  • Keeps fuel fresh for long term storage in your lawn mower, snow blower, boat, car, or motorcycle for up to 24 months
  • No more need to drain fuel prior to storage
  • Prevents gum and varnish build-up for quick, easy starts after storage
  • Effective in all gasoline fuels, including ethanol and non-ethanol
  • Compatible with all gasoline engines, including 2-cycle engines, as well as in your vehicles, motorcycles, small engines, generators, boats, and more

Klotz Storbilizer Gasoline Storage & Stabilizer Additive

Klotz

Based on 1 reviews Check latest price

Product description

Not sale or use in the state of California

  • Stabilizes ethanol and gasoline mixtures
  • Helps prevent oxidation and corrosion
  • Recommended for pre-mix or ethanol/gasoline blends
  • Provides six to eight months protection
  • Allows quick and easy start-ups following extended storage

STA-BIL Fuel Stabilizer, 1 Gallon

Based on 179 reviews Check latest price

Product description

Fuel Stabilizer, Performance Improver, Container Size 1 Gallon, Boiling Point 180 F, Dissolves Gum and Varnish, For Use With Gasoline Powered Engines

  • Auto & Truck Maintenance
  • Country of manufacture: United States
  • Manufacturer: STA-BIL

User questions & answers

Question: what is the difference between Sta-bil storage and Sta-bil stabilizer
Answer: 1 ounce will treat 2 gal.
Question: Can this be used on old gasoline
Answer: Yes
Question: Can this be used in Outboard Marine engines
Answer: I believe it will. It worked on the gas in a generator I have that sat either 3 or 4 years. Ran just fine. I also use it in long term storage gas cans. I know it's better to just rotate cans and put some in the car every month but I never seem to keep up with it.......
Question: what is the shelf life for sta-bil after opening and does sta-bil marine have any advantage over sta-bil red? thx
Answer: yes to all of your questions, heard that this product is used by the military. It is highly recommended by people I know. They say it can be used to store gas for years without going bad. Also can rejuvenate bad gas from reviews I've seen. I've only been using it for 6 months so far with no complaints. Highly concentrated formula compared to other products that are similar

STA-BIL 360 Marine Ethanol Treatment and Fuel Stabilizer - Prevents Corrosion - Helps Clean Fuel System For Improved In-Season Performance - Treats Up To 320 Gallons, 32 fl. oz. (22240)

STA-BIL

Based on 3 reviews Check latest price

Product description

Fuel Treatment, Ethanol, Container Size 32 oz. , Size/Net Weight 32 oz. , Blue/Green, Bottle, Transparent, Treats 320 Gallons Dilution Ratio, Boiling Point 180 F, Flash Point 173 F, 0. 9 Specific Gravity, For Use With Ethanol Engines

  • Auto & Truck Maintenance
  • Country of manufacture: United States
  • Manufacturer: STA-BIL

User questions & answers

Question: How many gallons of fuel will one gallon og sta-bil treat
Answer: It depends. You use 1 oz per 5 gallons to store gas and 1 oz to 10 gallons in your gas tank to reduce ethanol and keep your fuel system clean.
Question: How well does it in motorcycles and cars
Answer: I use it in my cars and mowers w/out any issues. In fact, I think I get slightly better fuel mileage w/ this in the tank at the 1 oz/10 gal concentration.
Question: If Sta-Bil Marine removes the water from the tank/engine etc., where does it remove the water to? Where does the water go
Answer: Typically these types of treatments allow the water to pass thru the engine without harm. Might want to contact Sta-Bil tech for the actual process and tech behind it.
Question: Is there a shelf life on the product itself (not mixed with gas
Answer: Five years if unopened. If it is open and has significantly darkened or crystalized I would NOT use it.Probably best used by two years.WRL

Product features

STA-BIL 360 Marine Ethanol Treatment & Fuel Stabilizer

STA-BIL 360 MARINE – use it with every fill up to help keep your engine running cleaner, leaner, smoother and stronger than ever.

1oz treats up to 10 gallons (38 liters) of fuel​. Product does not contain alcohol. Perfect for use in all boats, jet skies, and other watersport engines.

Take Performance Over The Top

PREVENT ETHANOL DAMAGE: Protect your entire fuel system against damaging rust and corrosion caused by moisture and ethanol fuels. Provides a protective coating on ALL the metal parts of the entire fuel system and combustion chamber, even when the engine is not running.

MAXIMIZE FUEL ECONOMY: Burn fuel more completely and efficiently by preserving the fuel system and engine.

Take Performance Over The Top

INCREASE POWER: Strip away carbon buildup, gum and varnish that can inhibit engine performance, and get the most out of your fuel by burning it more completely. Bring back the power your engine once knew. Clear and prevent harmful gum, varnish and buildup throughout the combustion chamber and injectors.

Product benefit claims are effective when used as directed. STA-BIL outperforms competition.

Star brite Star Tron Gasoline Additive (8 oz)

STAR BRITE

Based on 137 reviews Check latest price

Product description

Star brite Star Tron Gasoline Additive (8 oz)

  • Cures and prevents ethanol fuel problems
  • Helps prevent phase separation
  • Makes engines start easily, run smooth
  • Stabilizes gasoline for up to 1 year

User questions & answers

Question: Is this for 32oz or 8oz
Answer: I think the others are talking about the shelf life of treated fuel and not Sta-Bil itself. I've used Sta-Bil more than 15 years after first use from a container of it, and it still worked great. It has a very long shelf life after opening. The plastic container that the Sta-Bil comes in probably has a shorter life than the contents. I have never used Sta-Bil Marine, so I can't comment on it.

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