What’s the best fuel treatment to keep your engine running strong?
Here are 10 top additives that deliver smoother starts, cleaner injectors, and reliable protection—so you can trust your engine every time.
Fuel treatments save engines, time, and money. They prevent stale gas, clean injectors, and shield against corrosion—every vehicle needs them.
Users pour in a bottle and feel smoother starts instantly. Many report engines running quieter after treatment. Stored mowers and boats fire up reliably after months idle.
This guide cuts through confusion. You’ll find the exact additive for your engine’s needs. Keep reading—your next start could be your best yet.
List of Top 10 Fuel Treatments
| Image | Title | Best For | Price |
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STA-BIL Storage Fuel Stabilizer | Keeps Fuel Fresh for 24 Months, Prevents Corrosion, Gasoline Treatment Fuel Additive that Protects Fuel System, Gas Stabilizer for Fuel Storage, 32 oz. |
Do you need to keep your fuel fresh? This is the perfect product for anyone who stores fuel for long periods. It prevents corrosion, keeps fuel fresh for up to 24 months, and works in both 2-cycle and 4-cycle engines. |
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Chevron Techron Concentrate Plus Fuel System Cleaner, 20 oz., Pack of 1 |
Is your car not running like it used to? Chevron Techron Concentrate Plus is for you. It helps fix rough idling and poor performance. This cleaner also helps keep your fuel fresh. If you want to keep your car smooth and reliable, grab this today. |
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Lucas Oil 10020 Upper Cylinder Lube/Fuel Treatment – 5.25 fl oz. |
Want to boost your engine’s power? This fuel treatment is for you! It’s perfect for anyone wanting to improve fuel economy and extend the life of their engine. |
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STAR BRITE Star Tron Enzyme Fuel Treatment – Small Engine Formula – Gas Additive Rejuvenates & Stabilizes Old Gasoline – Cures & Prevents Ethanol Problems – 8 OZ (14308) |
If your engine sits idle for weeks or months, Star Tron is your must-have guardian. It revives stale gasoline and shields against ethanol damage—so lawnmowers, boats, generators, and classic cars fire up fast and run strong every time. No more wasted fuel, no more frustrating starts, just smooth, clean power in any engine, any fuel. |
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Heet Iso-HEET Water Remover And Premium Fuel Line Antifreeze + Injector Cleaner Helps Increase Gas Mileage Improves Engine Performance Year Round Performance, 12 fl. oz. (28202) , Red |
This product is perfect for drivers who want reliable year-round engine protection, especially those dealing with moisture in their fuel system. If you're tired of rough starts, poor mileage, or worrying about water freeze-ups in winter, Iso-HEET is your simple, powerful solution. It's ideal for car owners, daily commuters, and weekend road trippers who demand clean injectors and smooth performance in all temperatures. Keep your fuel lines clear and your engine running strong—every tank, every season. Trust it if you value efficiency and long-term vehicle care without gimmicks or complicated routines. Just 12 ounces delivers big results, bottle after bottle. |
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Lucas Oil 10013 Fuel Treatment – 1 Gallon |
Truck drivers logging endless miles, diesel owners who demand peak performance, and gasoline vehicle owners tired of sluggish acceleration and rising fuel costs need Lucas Oil 10013 Fuel Treatment. It’s the #1 fuel additive worldwide for cleaning injectors, boosting MPG, and protecting your engine’s critical parts. If you want smoother starts, quieter pumps, and real savings at the pump, this gallon-sized powerhouse is built for you. Stop carbon buildup in its tracks—keep your engine running strong and efficient. |
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STA-BIL Fast Fix – Small Engine Treatment, Cleans Carburetors and Injectors, Fixes Rough Running Engines, Eliminates Water, Treats Up to 20 Gallons, 8oz (22304) , Green |
STA-BIL Fast Fix is perfect for anyone with small engines that need a quick fix. Whether you’re dealing with a rough-running lawn mower, chainsaw, or generator, this easy-to-use treatment will clean carburetors, remove water, and get your engine running smoothly again. |
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Power Service 1025-12PK +Cetane Boost Diesel Fuel Supplement Anti-Freezer – 1 Quart, (Pack of 12) |
This product is perfect for diesel drivers who want to protect their engines in cold weather. It’s great for anyone using Ultra Low Sulfur Diesel (ULSD) or biodiesel blends. |
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Lucas Oil 10977 High Mileage Fuel Treatment – 5.25 Ounce |
Is your car getting older? Does it have a lot of miles? Lucas Oil High Mileage Fuel Treatment is perfect for you. It cleans your fuel system and helps your engine run better. |
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STA-BIL Fuel Stabilizer – 16oz |
Anyone who stores gasoline-powered equipment like lawnmowers, chainsaws, generators, or classic cars needs this. It’s perfect for keeping fuel fresh and engines ready to run, even after months of sitting. Stop wasting money on degraded fuel—STA-BIL saves your gas and your gear. |
Detailed Reviews
Find the best fuel treatment for your needs. We’ve combined expert insights and user feedback to make it simple. Discover top products and keep your engine running smoothly.
1. STA-BIL Storage Fuel Stabilizer | Keeps Fuel Fresh for 24 Months, Prevents Corrosion, Gasoline Treatment Fuel Additive that Protects Fuel System, Gas Stabilizer for Fuel Storage, 32 oz.
Stop fuel from going bad. Ethanol in gasoline attracts moisture and causes corrosion, gum, and varnish. STA-BIL Storage Fuel Stabilizer protects your engine by keeping fuel fresh for up to 24 months.
Just 1 ounce treats 2.5 gallons of fuel. Works in all 2-cycle and 4-cycle engines—lawn mowers, generators, boats, and cars. Replaces Cub Cadet 22216 and 22287.
Pour it in before storage. Your engine starts clean, runs smooth, and stays protected. Don’t risk stale fuel—treat it right.
| Pros | Cons |
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Perfect For:
Do you need to keep your fuel fresh? This is the perfect product for anyone who stores fuel for long periods. It prevents corrosion, keeps fuel fresh for up to 24 months, and works in both 2-cycle and 4-cycle engines.
Ready to Purchase?
2. Chevron Techron Concentrate Plus Fuel System Cleaner, 20 oz., Pack of 1
One bottle. Major results. Chevron Techron Concentrate Plus cleans your entire fuel system fast. Feel the difference with smoother starts and steady power. It’s proven science in a simple 20 oz. bottle.
It chases away rough idle and hesitation. Your engine runs cleaner, quieter, and more responsive. Just pour it in—no tools, no hassle.
Protect your engine today. Works as you drive to keep injectors and valves spotless. Lasts up to a year—stabilizes fuel and boosts cold starts. Easy, effective, essential.
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Perfect For:
Is your car not running like it used to? Chevron Techron Concentrate Plus is for you. It helps fix rough idling and poor performance. This cleaner also helps keep your fuel fresh. If you want to keep your car smooth and reliable, grab this today.
Ready to Purchase?
3. Lucas Oil 10020 Upper Cylinder Lube/Fuel Treatment – 5.25 fl oz.
Lucas Oil 10020 is a top fuel additive for gasoline and diesel engines. It works like a tune-up in a bottle, boosting MPG and power. This 5.25 fl oz treatment is easy to use and highly effective.
It cleans and lubricates the fuel system, from injectors to the combustion chamber. By burning excess emissions, it improves fuel economy and reduces deposit buildup. This prolongs engine life and saves you money over time.
Neutralizes harmful contaminants and prevents rust. Safe for older engines and meets federal standards. A must-have for better performance and longevity.
| Pros | Cons |
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Perfect For:
Want to boost your engine’s power? This fuel treatment is for you! It’s perfect for anyone wanting to improve fuel economy and extend the life of their engine.
Ready to Purchase?
4. STAR BRITE Star Tron Enzyme Fuel Treatment – Small Engine Formula – Gas Additive Rejuvenates & Stabilizes Old Gasoline – Cures & Prevents Ethanol Problems – 8 OZ (14308)
Starts every engine fast. Even after months sitting, Star Tron’s enzymes break down old fuel so your engine fires up smoothly every single time.
Solves ethanol problems like rough idle, poor performance, and clogged systems—protecting your engine and saving you money. Made in the USA since 1973, it stabilizes fuel for up to 2 years and works in cars, boats, mowers, and RVs.
Restores old gasoline and keeps fuel systems clean for better mileage and fewer emissions. Just one oz treats 16 gallons—powerful, simple, and reliable.
| Pros | Cons |
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Perfect For:
If your engine sits idle for weeks or months, Star Tron is your must-have guardian. It revives stale gasoline and shields against ethanol damage—so lawnmowers, boats, generators, and classic cars fire up fast and run strong every time. No more wasted fuel, no more frustrating starts, just smooth, clean power in any engine, any fuel.
Ready to Purchase?
5. Heet Iso-HEET Water Remover And Premium Fuel Line Antifreeze + Injector Cleaner Helps Increase Gas Mileage Improves Engine Performance Year Round Performance, 12 fl. oz. (28202) , Red
Iso-HEET Water Remover is a powerful product for your vehicle. It helps remove water from fuel lines. This keeps your engine running smoothly.
This premium fuel line antifreeze works well in any weather. It can help improve your gas mileage. You will notice better engine performance all year round.
Use Iso-HEET to keep your fuel system clean. It’s simple and effective for all drivers.
| Pros | Cons |
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Perfect For:
This product is perfect for drivers who want reliable year-round engine protection, especially those dealing with moisture in their fuel system. If you're tired of rough starts, poor mileage, or worrying about water freeze-ups in winter, Iso-HEET is your simple, powerful solution.
It's ideal for car owners, daily commuters, and weekend road trippers who demand clean injectors and smooth performance in all temperatures. Keep your fuel lines clear and your engine running strong—every tank, every season.
Trust it if you value efficiency and long-term vehicle care without gimmicks or complicated routines. Just 12 ounces delivers big results, bottle after bottle.
Ready to Purchase?
6. Lucas Oil 10013 Fuel Treatment – 1 Gallon
Lucas Oil 10013 Fuel Treatment is the world’s #1 fuel additive. It works for both gasoline and diesel engines. This product is like a great tune-up in a bottle.
It cleans and lubricates your fuel system. It helps improve fuel economy too.
Using this treatment can increase power and acceleration. It also prevents rust and corrosion. Protect your engine and make it last longer with Lucas Oil.
| Pros | Cons |
|---|---|
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Perfect For:
Truck drivers logging endless miles, diesel owners who demand peak performance, and gasoline vehicle owners tired of sluggish acceleration and rising fuel costs need Lucas Oil 10013 Fuel Treatment. It’s the #1 fuel additive worldwide for cleaning injectors, boosting MPG, and protecting your engine’s critical parts. If you want smoother starts, quieter pumps, and real savings at the pump, this gallon-sized powerhouse is built for you. Stop carbon buildup in its tracks—keep your engine running strong and efficient.
Ready to Purchase?
7. STA-BIL Fast Fix – Small Engine Treatment, Cleans Carburetors and Injectors, Fixes Rough Running Engines, Eliminates Water, Treats Up to 20 Gallons, 8oz (22304) , Green
Is your small engine giving you trouble? STA-BIL Fast Fix is here to help. It cleans carburetors and injectors quickly. Get your engine running smoothly again!
It also eliminates water from your fuel. This prevents engine disassembly
STA-BIL Fast Fix works in many small engines. Use it in your lawn mower or snow blower. You will love how well it works!
| Pros | Cons |
|---|---|
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Perfect For:
STA-BIL Fast Fix is perfect for anyone with small engines that need a quick fix. Whether you’re dealing with a rough-running lawn mower, chainsaw, or generator, this easy-to-use treatment will clean carburetors, remove water, and get your engine running smoothly again.
Ready to Purchase?
8. Power Service 1025-12PK +Cetane Boost Diesel Fuel Supplement Anti-Freezer – 1 Quart, (Pack of 12)
Stop fuel gelling cold—even in brutal winter weather. Power Service Diesel Fuel Supplement + Cetane Boost keeps your fuel flowing when temperatures drop below zero. No more frozen filters or engines that won’t turn over.
Get faster starts and smoother operation every single time you fire up. Our formula boosts cetane for quick ignition and adds Slick diesel lubricator to shield pumps and injectors from ULSD wear. Works flawlessly in all diesel, biodiesel blends included.
Protect your engine. Prevent costly downtime. Just add one bottle per tank—it’s that simple.
| Pros | Cons |
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Perfect For:
This product is perfect for diesel drivers who want to protect their engines in cold weather. It’s great for anyone using Ultra Low Sulfur Diesel (ULSD) or biodiesel blends.
Ready to Purchase?
9. Lucas Oil 10977 High Mileage Fuel Treatment – 5.25 Ounce
Lucas Oil 10977 High Mileage Fuel Treatment is a powerful and effective solution for your engine. It cleans and protects fuel injectors, reducing deposits in the intake valves and combustion chamber. This treatment lubricates vital parts in the fuel system and engine, ensuring smooth performance.
It stops knocking and hesitation, and reduces oil contamination in older engines. This fuel treatment is a must-have for maintaining your vehicle’s performance and extending its life.
| Pros | Cons |
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Perfect For:
Is your car getting older? Does it have a lot of miles? Lucas Oil High Mileage Fuel Treatment is perfect for you. It cleans your fuel system and helps your engine run better.
Ready to Purchase?
10. STA-BIL Fuel Stabilizer – 16oz
The STA-BIL Fuel Stabilizer is a reliable product designed to keep your fuel fresh. It is perfect for both gasoline and diesel engines.
This 16oz bottle helps prevent fuel breakdown. It can save you time and money by keeping your engine running smoothly. Using it is simple and effective.
With STA-BIL, you can trust that your fuel will stay stable for up to 24 months. It also protects against rust and corrosion. Enjoy peace of mind knowing your engine is well cared for.
| Pros | Cons |
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Perfect For:
Anyone who stores gasoline-powered equipment like lawnmowers, chainsaws, generators, or classic cars needs this. It’s perfect for keeping fuel fresh and engines ready to run, even after months of sitting. Stop wasting money on degraded fuel—STA-BIL saves your gas and your gear.
Ready to Purchase?
Buying Guide
Fuel treatments keep engines running strong. They stop bad gas, clean injectors, and fight rust. Every car, mower, or boat needs them to start easy and last longer.
People pour in a bottle and feel smoother starts right away. Engines run quieter, and stored equipment fires up perfectly after months. No more frustration—just reliable power when you need it.
Choose the right additive for your engine’s needs. This guide matches top products to your fuel type, use, and goals. Keep reading—your next start could be trouble-free and smooth.
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Factor: Engine Type
Match the product to your engine. Gasoline, diesel, 2-cycle, or 4-cycle each need specific formulas. Using the wrong one can waste money or even harm parts. -
Factor: Purpose
Know what problem you’re solving. Storage protection needs a stabilizer like STA-BIL. Cleaning rough idle calls for a system cleaner like Techron or Lucas. Water removal demands products like Iso-HEET or Fast Fix. -
Factor: Treatment Frequency
Decide how often you’ll treat. Long-term storage (6+ months) needs stabilizers. Regular driving benefits from cleaners used every few thousand miles. Seasonal engines (lawn mowers, snowblowers) need pre-storage dosing. -
Factor: Fuel System Condition
Assess your engine’s health. Dirty injectors or hesitation? Pick a strong cleaner (Techron, Lucas). Old or high-mileage engines? Use a lubricating treatment. No issues yet? A stabilizer prevents future problems. -
Factor: Ease of Use
Opt for simple application. Most top treatments are pour-and-go—no tools or skills needed. Just add the right ounces per gallon before starting or storing. -
Factor: Protection Duration
Check how long protection lasts. STA-BIL Storage protects for 24 months. Lucas or Techron cleaners work for months as you drive. Star Tron stabilizes for up to 2 years and revives old fuel. -
Factor: Ethanol Protection
Ethanol blends attract water and cause corrosion. STA-BIL, Star Tron, and Iso-HEET all guard against this. If you use E10 or higher, this feature is a must for long engine life. -
Factor: Climate & Conditions
Cold weather demands anti-gel and water control. Power Service Diesel Supplement prevents gelling in winter. Iso-HEET removes water in any climate. Hot or humid areas need strong stabilizers to stop fuel breakdown. -
Factor: Cost & Coverage
Compare cost per treatable gallons. STA-BIL 32 oz treats up to 80 gallons. Lucas 1-gallon treats 300+. Star Tron 8 oz treats 128 gallons. More concentrated = more value over time. -
Factor: Brand Trust & Proven Results
Stick with leaders like STA-BIL, Lucas, Chevron Techron, and Star Tron. They’re backed by mechanics, boaters, and drivers who rely on them daily. Proven performance beats unknown brands. -
Factor: Safety for Older Engines
Some additives are too harsh for vintage parts. Lucas and Star Tron are safe for older engines. Always check labels if you drive a classic car or use old small engines. -
Factor: Resolving Performance Issues
Rough idle, stalling, or hard starts? Fast Fix clears water and clogs fast. Techron or Lucas restore power and clean injectors with regular use. Pick based on the symptom you face. -
Factor: Environmental & Emission Benefits
Clean engines run more efficiently and pollute less. Treatments like Star Tron and Lucas reduce deposits, helping you get better mileage and fewer emissions with every tank. -
Factor: Multi-Vehicle Use
Need one bottle for cars, boats, mowers, and generators? STA-BIL Storage, Star Tron, and Lucas work across fuel types and equipment. Saves shelf space and delivers reliable results everywhere.
Pick your fuel problem. Match it to the right treatment above. Pour it in, protect your engine, and enjoy smoother starts today.