Maintaining clean injectors ensures optimal performance out of your lawn mower. Over time, deposits can build up on the injectors, causing them to become clogged, deteriorating, and less efficient. It can lead to loss of power and increased fuel consumption.

With the best fuel stabilizer for lawn mowers, you can prevent the formation of gum and varnish in stored fuel. It can reduce harmful emissions and make your lawn mowing experience more pleasant. 

This treatment will ensure your lawn mower runs all season smoothly. You should be able to use it with both gasoline and diesel.

Here we share a few fuel stabilizers that can keep your lawn mower’s fuel system in top shape.

STA-BIL Fuel Stabilizer in Lawn Mower Gas

Hot Shot’s Secret Diesel Fuel Stabilizer Treatment

Star Brite Star Tron Enzyme Fuel Treatment

Top 5 Recommended Best Fuel Stabilizer for Lawn Mower

Fuel stabilizers keep your lawn mower always in good condition and ready to go when you need the vehicle. They help to keep the gas in your lawn mower fresh and free of moisture, which can cause corrosion and other damage.

There are many different brands and formulas of fuel stabilizers on the market. We have compiled a list of the top five lawn mower fuel stabilizers to help you make an informed decision. Our recommendations are based on compatibility, treat ratio, and more.

01. STA-BIL Fuel Stabilizer in Lawn Mower Gas

A fuel stabilizer by STA-BIL helps to keep gasoline from deteriorating in storage. By keeping gas uncontaminated for a long time, this treatment ensures that your lawn mower will always start easily and run smoothly. 

Highlighted Features:

  • Stores fuel in fresh for up to 24 months
  • Prevents fuel from being drained before storage
  • Provides quick, easy starting after storage
  • Keeps gum and varnish from building up
  • Suitable for ethanol blend gasoline
  • Keeps gas fresh for up to 2 years once opened
  • Ensures gasoline doesn’t deteriorate in fuel storage
  • 1 bottle can treat up to 2 lawn mowers, bikes, or cars
  • Great for the Northeast area when it snows
  • Fuel will be treated and preserved for emergency home generator
  • Works well for snow blowers and other gas-powered vehicles

Very Efficient:

The STA-BIL fuel stabilizer in lawn mower gas is very efficient, allowing you to get the most out of your gas. With sizes ranging from 4 ounces to 64 ounces, you can treat anything from a lawn mower to a car.

One bottle of the 4 oz size can even treat up to two riding mowers, bikes, or cars. Its 32 oz size is suitable for larger vehicles or marine engines.

Prevents Gas from Going Bad:

STA-BIL keeps gas fresh for up to 2 years after opening the bottle, so you can be sure that your mowing machine will always start on the first try. This red fuel stabilizer keeps gas from spoiling, so you don’t have to worry about your mower’s engine being damaged by old gas.

Snowy and Spring Maintenance Friendly:

In the Northeast, STA-BIL fuel stabilizer comes in handy because you don’t have to change your gas when it snows. It is also easy for spring maintenance when riding the mower. 

Simply add it to your lawn mower gas tank according to the directions on the bottle. When used as directed, STA-BIL will help keep your lawn mower’s engine running smoothly and extend the life of your gas.

Versatile in Use:

STA-BIL storage fuel stabilizer is used to treat gas in lawn mowers and modern cars. It is also a good choice for classic cars because it helps to keep the fuel fresh and prevents corrosion. 

By preserving fuel, you can use it for emergency generators at home. You can use it in snow blowers and other gas-powered machines, too.

Drawbacks:

  • It can be difficult to pour into the tank due to the shape of the bottle.
    • You can easily solve this problem by using a plastic funnel which will help direct the liquid flow into the small opening without any spillage. 
    • Another solution is to transfer the stabilizer to a different container with a wider mouth, such as a recycled soda bottle.
  • The 4 oz size wouldn’t fill up a full tank.
    • You would have to buy multiple bottles or a larger ounce bottle to use on your lawn mower.

Verdict:

This fuel stabilizer is a very efficient product that helps ensure that gasoline doesn’t deteriorate in storage and keeps gas good throughout its life. Pour it into the gas tank and run the engine for a few minutes to circulate the stabilizer.

It prevents fuel degradation and clogging, and it also protects against corrosion. As a result, STA-BIL is an essential product for any homeowner with a lawn mower.


02. Hot Shot’s Secret Diesel Fuel Stabilizer Treatment

Diesel fuel treatment from Hot Shot’s Secret helps to improve engine response and extends filter life. It reduces emissions, making it a great choice for those concerned about the environment.

Highlighted Features:

  • Improves engine response and reduces emissions
  • Restores fuel mileage and extends filter life
  • Superior fuel additives for treating a large amount of fuel
  • Cetane booster Up To 7 Points
  • Keeps old gasoline engines running smoothly
  • Cleans and quiets injectors and produces less smoke
  • can be used in motor homes, trucks, scooter engines
  • Built-in measuring cap to pour the correct amount of treatment
  • Storage is possible under the back seat using a one-gallon freezer bag

Restores MPG:

This treatment helps to restore fuel mileage so that you can get more bang for your buck at the pump. It’s suitable for treating a large volume of fuel used in lawn mowers, which is great for fleets with multiple vehicles.

Superior Fuel Additive:

It is a superior fuel additive that helps protect your diesel engine from corrosion and wear and can extend the life of your engine. The easily refillable bottle can be topped up at every pump, and the treatment will help to keep your engine free of deposits.

Keeps Engines Running Smoothly:

This treatment helps to keep your fuel fresh and prevents it from breaking down, even after long periods of storage. You can enjoy smooth engine performance mile after mile. And if your fuel starts to break down, the treatment will help to restore it to its original condition quickly.

Simply add the recommended amount of fuel stabilizer to your lawn tractor’s tank and then fill it up with fuel. You can add the treatment to your fuel tank at any time.

Quiets Injectors and Emits Less Smoke:

Hot Shot’s Secret diesel fuel stabilizer treatment is designed to clean and quiet injectors. The treatment also helps to produce less smoke, making your engine run more efficiently.

Suitable for Different Automotives Engines:

It improves the performance of your Duramax V8 engine. The treatment can also be used in LML scooters, making them run better and last longer. It is specially formulated to provide superior lubrication for CP4 fuel pumps. You can use it to prevent wear and tear on motor home engines.

Built-in Measuring Cap:

This innovative product features a built-in measuring cap, so you can easily add the correct amount of treatment to your mower diesel tank. It can be stored under the back seat in a one-gallon freezer bag, so you’re always prepared for unexpected emergencies.

Drawbacks:

  • The bottle can be difficult to handle as it is coated in fluid.
    • Try wearing gloves or using a paper towel to grip it.
  • It may not increase mileage much for your new truck’s fuel system.
    • Use this diesel fuel stabilizer when your lawn mower is low on power or if you’re noticing a loss in fuel economy.

Verdict:

This diesel fuel stabilizer could be just what you need. The treatment contains a high concentration of anti-wear additives to improve fuel economy, extend filter life, and reduce emissions. If you’re looking for a way to keep your engine operating smoothly, consider Hot Shot’s Secret diesel treatment.


03. STA-BIL 360 Gas Additive Fuel Treatment

The gas additive fuel stabilizer from STA-BIL is a unique product that treats fuel for up to 12 months. It saves money on fuel by treating the fuel with ethanol. This fuel treatment also helps to prevent corrosion and keeps the entire fuel system clean.

Highlighted Features:

  • Protects from corrosion due to ethanol blended fuels
  • Suitable for fuels blended with ethanol and non-ethanol gas
  • The temperature at flash point: 80°C
  • Treats fuel for up to one year
  • treats fuel with ethanol and provides immediate results
  • Cleans gas lines and restores performance
  • Keeps machinery running smoothly
  • 1 oz treats up to 5 gallons
  • Cheaper than ethanol-free gas
  • Prevents ethanol-related damage
  • Safe to use with all small gasoline engines

Keeps Machines Running Smoothly:

STA-BIL 360 Gas Additive Fuel Treatment works well to keep your engine running smoothly. It works quickly and efficiently so that you’ll see results immediately after adding it to your fuel.

Its unique formula contains enzymes that break down grease, oil, and other deposits that can build up in gas lines and cause performance issues. 

Increases MPG:

This product can increase truck MPG by 1.2 to 1.5. It can treat up to 5 gallons of gasoline by using 1 oz, making it a cost-effective way to improve your vehicle’s performance.

Prevents Ethanol-Related Damage:

STA-BIL 360 protection fuel stabilizer is a top-of-the-line product that prevents damage caused by ethanol-blended gasoline. It is cheaper than ethanol-free gasoline and purportedly reduces engine wear and tear. STA-BIL’s treatment eases corrosion and clogging caused by ethanol deposits.

Safe to Use:

The treatment is safe for any small engine, resulting in smooth operation. Usually, these engines are used in lawn mowers and other types of equipment that people use to maintain their yards.

Suitable for Capless Tanks:

Another feature of the fuel stabilizer is its use in capless gas tanks. This is significant because capless gas tanks are becoming more common in newer cars and trucks.

Useful in Many Engines:

It can be used in many different diesel and gasoline engines. You can use it in a 1959 Chevy car engine and a large Toyota Tundra V8 engine, as well as a full-sized SUV V8 engine. It is also applicable to the 2017 Honda Civic engine since this model is popular and driven by many people.

Drawbacks:

  • The head is not long enough to fit in a capless car’s tank.
    • Pick the 10 oz model, which should be able to reach the bottom of most fuel tanks.
  • If you mix E10 and E 15 gas, you may notice a decrease in performance.
    • Avoid mixing these two types of gasoline if possible.

Verdict:

It is effective and safe to use and will help keep your engine running smoothly. This product also does a great job of preventing fuel degradation, saving you money at the pump. Overall, this fuel stabilizer is a great choice for small lawn mower engines to increase fuel efficiency.


04. Star Brite Star Tron Enzyme Fuel Treatment

Enzyme fuel treatment by Star Brite is designed to rejuvenate bad gas and return it to a running condition. This fuel treatment can be used in very old engines, and it is safe for all types of engines, including diesel.

Highlighted Features:

  • Rejuvenates bad gas to a running condition
  • Stabilizes fuel for up to 2 years
  • Maintains maximum stability during winter storage
  • Eliminates black soot and exhaust stains
  • Prevents the deterioration of fuel and reduces emissions
  • Prevents algae build-up associated with alcohol in gas
  • Cleans injectors and carburetors with long-term storage
  • Saves money on cleaning carbs
  • Can be used in all engines, including diesel
  • Keeps equipment running smoothly all winter
  • Safe for 2-stroke and 4-stroke engines

Maintains Maximum Stability:

It is an excellent fuel stabilizer. Star Brite Star Tron enzyme fuel treatment works for a long time and treats fuel for long storage. It helps to keep fuel stabilized and in good condition during winter storage.

The additive protects against the degradation that can occur over time. This degradation can lead to the formation of harmful deposits on engine parts, as well as a decrease in fuel economy and engine power.

Using this fuel treatment can help keep your gasoline engine running at peak performance and reduce the risk of costly repairs. It also keeps fuel fresh for up to two years.

Eliminates Gasoline Related Issues:

It is designed to prevent unleaded gasoline problems in lawn tractor engines. It helps to break down fuels, including ethanol, so they burn more completely and don’t leave behind residue that can clog carburetors.

The treated gas prevents the growth of algae produced by alcohol and other gasoline-related issues in small engine applications. This gas is less likely to foul spark plugs. Hence, you’ll enjoy smoother engine operation and improved fuel economy.

Improves Fuel Efficiency and Mileage:

This enzyme fuel treatment improves decent mileage by 1.5 mpg and keeps equipment running all winter smoothly. By keeping your system up and functioning, you’ll avoid the hassle and expense of repairs.

The first time you use it, you should add one ounce per 3 gallons of gas. After that, you only need to add one ounce per 6 gallons. This fuel stabilizer prevents gum and varnish build-up in your engine, keeping it running like it has premium gas.

Versatile:

It’s safe for both 2-stroke and 4-stroke engines so that you can use Star Tron in any lawn mower. This can be especially useful for generators that are only used occasionally. The product can be used in a snow thrower, chain saw, cars, motor homes, motorcycles, and boats. 

Drawbacks:

  • Many users have reported that it does not improve high gas mileage because the user may not follow the instructions properly.
    • To get the best results, use it as directed and use it with the type of gasoline specified on the package.

Verdict:

Star Tron enzyme fuel treatment contains alcohol-free formula and prevents gum and varnish formation in fuel, so it will not damage gasoline engine parts or reduce fuel economy.

It can help you get more miles per gallon and ensure the longevity of your lawn mower. So if you want a fuel treatment that can do it all, Star Brite Star Tron is the way to go.


05. STP Motor Treatment Fuel Stabilizer for Lawn Mower

STP has long been a trusted brand for motor treatment and fuel stabilizer products. Whether you want to extend the life of your old lawn mower or squeeze out a few more miles before turning it in, this fuel stabilizer can help. This powerful formula is designed to restore lost power, performance, and MPG.

Highlighted Features:

  • Stabilizes fuel to prevent rust buildup and degradation
  • Cleans engine deposits and helps reduce friction
  • Cleans fuel injectors and intake valves
  • Protects against viscosity buildup and sludge formation
  • Provides upper cylinder lubrication for improved performance
  • Compatible with all types of engines
  • Restores performance and MPG
  • Keeps engines running like new
  • Compatible with other brands
  • Can be used with all types of gasoline
  • Prevents the fuel filter from freezing up
  • No issues with gas sitting in the engine
  • Compatible with Different Brands:

The stabilizer is compatible with other brands and works with any gasoline engine, making it a versatile and convenient option. Their latest offering, STP motor treatment fuel stabilizer for lawn mower, is a Seafoam-like material that works better than Seafoam. 

Prevents Freezing up Issues:

It keeps the fuel filter from getting frozen and prevents water from accumulating in the fuel line. Consequently, the lawn mower will be able to start and run more smoothly, even in cold weather. It keeps engines running like new by preventing rust and corrosion.

Keeps Engine Clean:

This product helps to keep gas from clogging the engine, and it also helps to keep the lawn mower running smoothly in winter weather. The red funnel included with the product also helps clean out any clogged fuel systems.

You can lubricate engine parts with this fuel stabilizer treatment. It also works well on the fuel rails, fuel pump, and injectors. In this way, you can prevent potential problems down the lawn and keep your mower running smoothly throughout the season. This prolongs the life of the engine by keeping the fuel fresh.

Applications:

You can use it in gas-powered tools, diesel tractors, blowers, wood splitters, chainsaws, 4-wheelers, and string trimmers. After soaking carburetors and crankcases overnight, chainsaws work like new.

The stabilizer can increase the MPG of a 2001 Mustang car from 23 to 26. For a 2000 Ford Explorer car, it can increase the MPG from 18 to 20. This makes it an ideal choice for those who want to save money on gas.

Drawbacks:

  • Regular use can lead to a slight increase in MPG.
    • Use STP only when necessary, such as during periods of extended storage.
  • Some users reported that It could not solve the problem of the cold start for a 2000 Ford Explorer car.

Verdict:

As we have seen, this motor treatment fuel stabilizer provides excellent performance in maintaining lawn mower engines. This product helps to prevent fuel degradation, keeping your mower’s engine running like new. It also helps extend the lifespan of your mower by reducing wear and tear.


These are the best fuel stabilizers for a lawn mower today. Whether you are looking for a budget-friendly option or the best possible protection for your lawn mower, we are confident that you will find the perfect product on our list.

Comparison Chart for Fuel Stabilizer for Lawn Mower:

ProductStabilization Time


Prevention

Compatibility
VolumeTreatment per oz.
STA-BIL Fuel Stabilizer2 Yearsgum and varnishGasoline4 fl. oz.2.5 Gallons
Hot Shot’s Secret Diesel Fuel Stabilizer Treatment2 YearsRust and corrosionDiesel16 Ounce25 Gallons
STA-BIL 360 Gas Additive Fuel Treatment12 MonthsCorrosionGasoline10 fl. oz.5 Gallons
Star Brite Star Tron Enzyme Fuel Treatment2 YearsPhase separation, gums, and other solidsGasoline16 fl. oz.6 Gallons
STP Motor Treatment Fuel StabilizerAll Seasonoxidative degradationGas and diesel16 fl. oz.1.3 Gallons

Factors to Consider When Buying a Fuel Stabilizer for Lawn Mower

diesel engines

You are always looking for ways to improve the fuel efficiency of lawn mowers. Fuel stabilizers have become popular methods for preventing fuel contamination. Their purpose is to keep gasoline fresh for a longer time, and it can also help to improve diesel and gasoline engine performance.

It needs to be higher quality, has a long lifespan, and can handle the type of fuel you use. Here are a few things to consider when purchasing a fuel stabilizer for your lawn mower:

Compatibility with Fuel Types:

When it comes to lawn mowers, there are two main types of fuel: gasoline and diesel. Gasoline is the most common fuel type, and it is compatible with most brands of fuel stabilizers. Diesel is less common, but it is also stabilized with most brands.

The main difference between gasoline and diesel is the octane rating. Gasoline has a higher octane rating than diesel, which means that it can produce more power. Gasoline also has a higher risk of engine damage. Diesel is less likely to cause engine damage, but it can be more difficult to start in cold weather.

Ethanol is commonly used as a fuel additive, and it can be found in both gasoline and diesel fuel. This chemical compound can help to improve engine efficiency and reduce pollution.

The main Ethanol fuel used is E10, which is a gas that contains 10% Ethanol and 90% petrol. Ethanol can also be found in higher blends such as E15, E20, and E25.

Non-ethanol blended fuels do not contain Ethanol and are often used as standalone fuels instead of ethanol blends. They are made 100% from petroleum products.

Relevant Article: What Causes White Smoke From My Lawn Mower?

Treat Ratio:

Use the proper ratio in your lawn mower tank because too little ratio won’t be effective, and too much can damage your engine. The treat rate is the amount of fuel stabilizer per gallon of gas.

Most fuel stabilizers are added at a treat rate of 1 ounce per gallon of gas. The exact amount may vary depending on the manufacturer’s instructions. For example, some manufacturers recommend adding 1 ounce per 5 gallons of gas, while others recommend 1 ounce per 6 gallons.

Shelf Life:

lubricates fuel pumps

Remember that a fuel stabilizer does not last forever. The average shelf life of an unopened fuel stabilizer is between two and five years, but this can vary depending on the manufacturer.

Once you have opened the bottle, you should use it within six months. If you are unsure how long ago you bought the bottle or whether it has been opened, it is best to err on the side of caution and replace it.

Most fuel stabilizers will start working immediately. They may take up to two weeks to reach their full potential. For best results, add a fuel stabilizer to your mower’s tank at least two weeks beforehand. This will give the stabilizer plenty of time to work miracles.

Fuel Stabilization Time:

The stabilizer time of the fuel stabilizer varies depending on the brand and type of stabilizer you use. Most stabilizers will protect fuel for at least 12 months. In some cases, the stabilizer can even extend the shelf life of fuel by up to 24 months. The stabilizer will have time to work effectively and keep your fuel fresh for longer.

Cleaning and Protection:

Over time, lawn mowers can accumulate a lot of grime and build-up. This can come from dirt, dust, pollen, and other debris trapped in the engine and other parts of the mower. If left unchecked, this build-up can cause the mower to run less efficiently and lead to engine damage.

Fuel stabilizers can help to remove this build-up and restore the mower to peak performance. They can also clean the carburetor, spark plugs, and air filter. Fuel stabilizers help prevent rust and corrosion, gum & varnish build-up, and moisture dispersion.

They also reduce emissions, preventing exhaust stains, and black soot to improve engine performance. As a result, a lawn mower that uses a fuel stabilizer will run more smoothly and last longer.

Versatile in Use:

A fuel stabilizer is a versatile product that can be used in a variety of engines. While two-stroke and four-stroke engines require different types of fuel, a fuel stabilizer works in both.

Fuel stabilizers can be used in cars, trucks, motor homes, motorbikes, and boats. Having multiple vehicles or using different vehicles for different purposes makes them ideal for people with multiple vehicles.

How to Use a Fuel Stabilizer for a Lawn Mower?

ethanol fuel problems

For those who have a lawn mower, it is crucial to know the process of using a fuel stabilizer. This will help maintain fresh fuel and also help to prevent any damage that can occur from using old fuel. Here are some simple steps:

Step 01. Uncap and Pour the Stabilizer:

Unscrew the cap from the bottle. Remove the seal by taking it off from around the neck of the bottle.

Locate the opening for the fuel tank on the side or up of the lawn mower. Remove the tank cap and set it aside. Slowly pour the stabilizer into the fuel tank until it reaches the desired ratio.

Step 02 Seal the Bottle and Tank:

Seal your bottle and mower tank properly with their caps to ensure that no air or moisture gets in. Make sure that both the bottle and tank are clean and dry.

Place the cap on the bottle or tank, and screw it on tightly. Use a piece of tape to secure the cap further, if desired. Store the sealed bottle in a cool, dry place.

Step 03. Clean the Spilled Stabilizer:

Identify the area where the spill occurred. You may need to remove some grass or foliage to access the spill. Once you have located the spill, begin by absorbing the oil with a paper towel or a rag. 

Apply a generous amount of soap to the area and scrub with a brush or sponge. Use a garden hose to rinse away any liquids. If there is still stabilizer residue remaining, you can try using a solvent such as vinegar or rubbing alcohol. Apply the solvent to a cloth and dab at the stain until it disappears.

Step 04. Start the Engine:

Turn on the engine and run it for a while. This will allow the stabilizer to circulate through the entire fuel system and reach all the components.

After a few minutes, turn off the engine and allow the lawn mower to sit for at least an hour before using it. It will give the stabilizer time to work and protect the engine from corrosion.

How does a Fuel Stabilizer Work?

prevent phase separation

Fuel stabilizers work by inhibiting chemical breakdown, preventing the formation of harmful deposits, and keeping the fuel fresh for longer. They can help to protect engines from corrosion and degradation.

As a result, they are an essential part of any boat or RV owner’s maintenance routine. Fuel stabilizers are typically added to the tank before storage and are also available in convenient pre-treated gas cans.

FAQs:

Here are some of the most frequently asked questions about fuel stabilizers, along with a few tips for getting the most out of this product.

Q: Can you put too much fuel stabilizer in gas?

Adding too much stabilizer to your gas will not improve your mileage or performance any further. You should follow the manufacturer’s instructions when using a fuel stabilizer.

If you use too much, it can have the opposite effect. Too much stabilizer can clog fuel lines and prevent engines from starting. It can cause damage to catalytic converters and other emission control devices.

Q: When to put the fuel stabilizer in the lawn mower?

If you’re planning on storing your lawn mower for more than a month, it’s important to use a fuel stabilizer. Otherwise, gum and varnish can build up in the fuel, causing clogged injectors and reduced performance. 

By doing so, you will be able to preserve the fuel and prevent any engine damage. Just be sure to run the lawn mower for a few minutes after adding the stabilizer, so it has a chance to circulate through the system.

Q: Does the stabilizer in the lawn mower need to be drained?

Many people believe that they need to drain the stabilizer in their lawn mower before each use, but this is not necessary. If you drain the stabilizer, you will need to add more before each use, which can be expensive and time-consuming.

Destabilized gas can damage your lawn mower and reduce its lifespan. For these reasons, it is best to leave the stabilizer inside your mower and only add more when needed.

Q: What kind of stabilizer do I need for a lawn mower?

stabilize fuel

The type of stabilizer you need will be compatible with the type of fuel you are using. For example, if you are using gasoline, you will need a gasoline-compatible stabilizer. If you are using ethanol fuel, you will need an ethanol-compatible stabilizer. There are also all-in-one stabilizers for all fuels.

Q: How much STA-BIL do I need for 5 gallons of gas?

STA-BIL is a popular brand for fuel stabilizers, and their directions vary depending on the type of product you’re using. For STA-BIL 360 Protection amber liquid, you’ll need 1 ounce for every 5 gallons of gas. For another type: STA-BIL Storage Fuel Stabilizer, you’ll need 2 ounces for every five gallons.

Q: Is a lawn mower stabilizer the same as a snow blower stabilizer?

A lawn mower stabilizer and snow blower stabilizer are not the same. It is a chemical that is added to gasoline to help keep it from deteriorating while in storage. On the other hand, the snow blower stabilizer prevents the snow blower from freezing. Today, many lawn mower stabilizers can be used in snow blowers because they are all-in-one products.

Conclusion:

After conducting our research, we say that the best fuel stabilizer for lawn mowers can work with any fuel type, keep fuel fresh for a long time, and reduce fuel consumption.

We listed stabilizers in our list that have these features, and we believe that any of them would work great for your lawn mower.

Our buyer’s guide will help you choose a high-quality product, and the faqs section should answer any other questions that you may have about fuel stabilizers. 

Don’t forget to put a fuel stabilizer in the gas tank before storing your lawn mower at the end of the season.