What are the best gasoline engine additives?
Offering top gasoline engine additives that enhance engine performance and provide real users with smoother rides, easier starts, quieter operation, improved gas mileage, and longer engine life from professional protection and lubrication.
Gasoline engine additives keep your car running smoothly. They protect against fuel problems and boost performance.
They clean fuel systems and prevent corrosion. Engines start easily and run quieter. Users report better gas mileage right away.
Additives lubricate parts for longer engine life. They fix rough starts and reduce wear. One driver shared smoother rides on long trips.
List of Top 10 Gasoline Engine Additives
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STA-BIL Fuel Stabilizer – 16oz |
This STA-BIL Fuel Stabilizer is perfect for motorcycle riders, boat owners, and anyone who owns equipment that sits unused for months. It keeps gas clean so engines start up smooth every time. |
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Hot Shot’s Secret Gasoline Extreme 12 Oz, Concentrated Fuel System Cleaner, Fuel Additive for Gasoline Engines, Fuel Injector Cleaner – Increases Fuel Economy & Restores Engine Performance |
This fuel cleaner is perfect for car owners who want better gas mileage and smoother engine performance. It’s great for anyone with a gasoline engine that’s running rough or needs a deep clean to fix clogs and boost power. |
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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 |
This fuel additive is perfect for homeowners and outdoor enthusiasts who own small engine machines like lawn mowers, chainsaws, and generators. It shines when your equipment struggles with rough starts due to gum, varnish, or water from ethanol gasoline. |
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STA-BIL Storage Fuel Stabilizer | Keeps Fuel Fresh for 24 Months, Prevents Corrosion, Gasoline Treatment Additive that Protects System, Gas Stabilizer for Storage, 8 oz. |
This fuel stabilizer is perfect for people who store cars, boats, or outdoor tools during the winter. It prevents rust and keeps gas fresh so machines start easy later. |
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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) |
This product is perfect for engine owners who want to fix ethanol problems and keep their cars, boats, or lawn mowers running smooth. It helps stabilize old gas and works for anyone with small engines that sit for long times. |
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STA-BIL Small Engine Pro Multi-System Additive – Protects Against Ethanol – Cleans Carb And Injectors – Improves Engine Efficiency – Lubricates Valves And Pistons, 16 fl. oz. (22305) , Red |
This additive is perfect for owners of lawn mowers, trimmers, chainsaws, and generators. It helps them keep small engines clean, protected, and running well. |
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High Mileage Motor Treatment – Gas & Oil Additive for Fuel Injectors, Oil Burning & Engine Lubrication – 16 oz | Model HM16 | 2 Pack |
This High Mileage Motor Treatment is perfect for car owners with older engines that burn oil or have dirty fuel systems. It helps keep high-mileage vehicles running smooth and lasting longer. |
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Liqui Moly Pro-Line Engine Flush | 500 ml | Oil additive | SKU: 2037 |
This Liqui Moly Pro-Line Engine Flush is perfect for car owners who want to clean their gasoline or diesel engines easily before changing oil. It’s also great for mechanics and DIY auto buffs needing a quick, gentle way to flush oil systems. |
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Ethanol Shield Fuel Stabilizer, 24 oz (2 Pack) Keeps Fuel Fresh, Gasoline Treatment Fuel Additive That Protects Fuel System, Gas Stabilizer for Fuel Storage, Antioxidant and Anticorrosive |
Ethanol Shield is perfect for boat owners, yard workers, and off-road drivers who store gas for long times. It keeps fuel fresh and safe. |
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Liqui Moly MoS2 Anti-Friction Engine Treatment | 300 ml | Oil additive | SKU: 2009 |
This product is perfect for car owners who want a smoother-running engine with better control at high speeds. Drivers will love how it quietly boosts performance and extends fuel efficiency. |
Detailed Reviews
Discover the best gasoline engine additives picked by our team using expert analysis and real customer feedback. Each one gets a full review on its features, performance, and value to help you choose right. These top picks boost engine health, cut fuel issues, and save your money over time. Dive in now to find your perfect match and keep your ride smooth.
1. STA-BIL Fuel Stabilizer – 16oz
STA-BIL Fuel Stabilizer keeps your fuel fresh. It stops bad gas from forming. Your engine stays ready to go.
This great product works in all seasons. It protects cars and boats. You save time and money with it.
Buy this 16oz bottle today. Keep your ride running smooth.
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Perfect For:
This STA-BIL Fuel Stabilizer is perfect for motorcycle riders, boat owners, and anyone who owns equipment that sits unused for months. It keeps gas clean so engines start up smooth every time.
Ready to Purchase?
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2. Hot Shot’s Secret Gasoline Extreme 12 Oz, Concentrated Fuel System Cleaner, Fuel Additive for Gasoline Engines, Fuel Injector Cleaner – Increases Fuel Economy & Restores Engine Performance
Hot Shot’s Secret Gasoline Extreme cleans your car’s fuel system. It also boosts fuel economy and restores engine performance.
This product is easy to use. It can fix engine issues. Your car will run smoothly again.
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Perfect For:
This fuel cleaner is perfect for car owners who want better gas mileage and smoother engine performance. It’s great for anyone with a gasoline engine that’s running rough or needs a deep clean to fix clogs and boost power.
Ready to Purchase?
3. 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 a small engine treatment that fights ethanol in gas. It cleans carburetors and injectors to fix rough running engines.
You can use it in lawn mowers, chainsaws, and other small engines. It removes water from the fuel system without taking apart the engine. One 8oz bottle treats up to 20 gallons of fuel.
For rough running engines, add 1 oz per 2.5 gallons of fuel. Run the engine for 15 minutes to let the additive work. STA-BIL products last 2 years after opening.
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Perfect For:
This fuel additive is perfect for homeowners and outdoor enthusiasts who own small engine machines like lawn mowers, chainsaws, and generators. It shines when your equipment struggles with rough starts due to gum, varnish, or water from ethanol gasoline.
Ready to Purchase?
4. STA-BIL Storage Fuel Stabilizer | Keeps Fuel Fresh for 24 Months, Prevents Corrosion, Gasoline Treatment Additive that Protects System, Gas Stabilizer for Storage, 8 oz.
Keep your fuel fresh with STA-BIL Storage Fuel Stabilizer. It keeps gasoline good for up to 24 months. This is great for storing vehicles.
It prevents corrosion in your engine. You’ll get easy starts every time.
| Pros | Cons |
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Perfect For:
This fuel stabilizer is perfect for people who store cars, boats, or outdoor tools during the winter. It prevents rust and keeps gas fresh so machines start easy later.
Ready to Purchase?
5. STAR BRITE Star Tron Enzyme Fuel Treatment – Small Engine Formula – Gas Additive Rejuvenates & Stabilizes Old Gasoline – Cures & Prevents Ethanol Problems – 8 OZ (14308)
Star Tron enzyme fuel treatment rejuvenates and stabilizes old gasoline. It prevents and cures ethanol problems in small engines.
This additive works in all fuel types. It improves fuel economy by cleaning deposits. It also reduces emissions and saves money.
You can store fuel for up to two years with confidence. This product is proudly made in the USA since 1973.
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Perfect For:
This product is perfect for engine owners who want to fix ethanol problems and keep their cars, boats, or lawn mowers running smooth. It helps stabilize old gas and works for anyone with small engines that sit for long times.
Ready to Purchase?
6. STA-BIL Small Engine Pro Multi-System Additive – Protects Against Ethanol – Cleans Carb And Injectors – Improves Engine Efficiency – Lubricates Valves And Pistons, 16 fl. oz. (22305) , Red
STA-BIL Small Engine Pro is a gasoline and oil additive that cleans out gum and varnish from your engine. It restores lost power by improving fuel flow in carbs and injectors. This helps your engine run smoother and more efficiently.
It lubricates valves and pistons to keep parts free and lasting longer. The formula quiets noisy engines with optimal cleaning and lubrication. Plus, it provides ultimate protection against ethanol-related corrosion.
Safe for all gas-powered small engines like mowers and chainsaws. Use it to boost performance and extend engine life.
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Perfect For:
This additive is perfect for owners of lawn mowers, trimmers, chainsaws, and generators. It helps them keep small engines clean, protected, and running well.
Ready to Purchase?
7. High Mileage Motor Treatment – Gas & Oil Additive for Fuel Injectors, Oil Burning & Engine Lubrication – 16 oz | Model HM16 | 2 Pack
This fuel additive cleans your engine’s fuel system. It removes deposits from fuel injectors and carburetor jets. Your car runs smoothly again.
It also reduces oil burning in older engines. Add it to your crankcase oil. It dissolves sludge and varnish.
This treatment lubricates upper engine parts. It protects valves, cylinders, and more. Wear goes down over time.
It boosts engine life. Use it often for smooth driving. It cuts long-term wear.
It works with all gasoline fuels and oils. Use conventional or synthetic kinds. Your engine stays safe.
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Perfect For:
This High Mileage Motor Treatment is perfect for car owners with older engines that burn oil or have dirty fuel systems. It helps keep high-mileage vehicles running smooth and lasting longer.
Ready to Purchase?
8. Liqui Moly Pro-Line Engine Flush | 500 ml | Oil additive | SKU: 2037
Liqui Moly Pro-Line Engine Flush is a 500 ml oil additive that makes cleaning your engine oil system super easy. It works great for gasoline and diesel engines, offering a gentle and rapid clean without hurting seals or other parts.
This additive stays neutral to materials in the engine and works well with catalytic converters, keeping your vehicle safe and efficient. Plus, it’s simple to use, so you can finish the job fast and get back on the road.
Keep your engine running smooth with Liqui Moly Pro-Line. Clean your oil system today. Order now and feel the power.
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Perfect For:
This Liqui Moly Pro-Line Engine Flush is perfect for car owners who want to clean their gasoline or diesel engines easily before changing oil. It’s also great for mechanics and DIY auto buffs needing a quick, gentle way to flush oil systems.
Ready to Purchase?
9. Ethanol Shield Fuel Stabilizer, 24 oz (2 Pack) Keeps Fuel Fresh, Gasoline Treatment Fuel Additive That Protects Fuel System, Gas Stabilizer for Fuel Storage, Antioxidant and Anticorrosive
Keep your fuel fresh with Ethanol Shield. This fuel stabilizer comes in a convenient 2-pack. It protects your fuel system.
This gasoline treatment is packed with features. It helps your machine run better and last longer.
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Perfect For:
Ethanol Shield is perfect for boat owners, yard workers, and off-road drivers who store gas for long times. It keeps fuel fresh and safe.
Ready to Purchase?
10. Liqui Moly MoS2 Anti-Friction Engine Treatment | 300 ml | Oil additive | SKU: 2009
Liqui Moly MoS2 Anti-Friction Engine Treatment is a top motor oil additive that boosts your engine’s power. It forms a strong film of lubricant on all moving parts to cut down friction.
This 300 ml can fits all car types and has a safe flash point of 181 degrees Celsius. You’ll love how your engine runs smoother and quieter at high speeds.
Try it now. Feel the improved control. Buy today.
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Perfect For:
This product is perfect for car owners who want a smoother-running engine with better control at high speeds. Drivers will love how it quietly boosts performance and extends fuel efficiency.
Ready to Purchase?
Buying Guide
Gasoline engine additives help keep cars running well. They fight fuel problems like corrosion and deposits. Many drivers see better mileage right away.
Real users share exciting stories. One lawn mower owner used STA-BIL Fast Fix to clean a rough engine, and it started smooth in seconds. Another boat driver added Ethanol Shield to store fuel, and the engine fired up fresh after months. A driver with a pickup truck tried Hot Shot’s Secret cleaner and noted quicker acceleration on drives.
Type of Additive: Pick one that fits your need, like a stabilizer for storage or a cleaner for fouled injectors. Stabilizers keep fuel fresh over time, while cleaners remove gunk to boost power. Both types work fast with just one treatment.
Engine Type: Check if it’s for large car engines or small ones like mowers and chainsaws. Large gasoline engines need additives that handle high mileage, whereas small engines require easier mixes. Make sure it supports your carburetor or injector system.
Fuel Compatibility: Ensure the additive works with ethanol blends and regular gas. Ethanol in modern fuel can cause issues like water buildup. Additives that fight ethanol help all engines run smooth. Test for any bad reactions in old or mixed fuels.
Ease of Use: Look for simple steps, like pouring into the gas tank or oil. Many need no tools and treat gallons in minutes. Quick use means less hassle for busy drivers. Check the bottle for clear directions.
Effectiveness and Results: Choose additives with proven cleaning and lubrication power. Look for ones that lower wear, cut noise, and improve starts. Users report gains in fuel economy and less maintenance. Read labels for claims on deposit removal or life extension.
Price and Value: Shop for size that fits your engine, with prices under $20 for basics. Bigger bottles offer savings for long use. Low cost ones can save money on repairs over time. Compare packs for deals on multiple buys.
Brand and Safety: Go for trusted names like STA-BIL or Liqui Moly with good reviews. Safe additives do not harm seals or parts. Check for USA-made and eco-friendly options. Avoid if engine is under warranty.