10 Best Engine Cleaner Additive of December 2025

• For best performance, follow the manufacturer's recommendations in your vehicle owner’s manual.

Chevron

• DESIGNED TO EXCEED EXPECTATIONS: Red Line complete SI-1 fuel system cleaner treatment for cleaning & preventing corrosion in fuel systems
• PERFORM & PROTECT: Fuel additive cleans injectors, carburetors, valve & combustion chamber deposits with a powerful, concentrated blend of high-temp and low-temp detergents
• EFFICIENT FUEL BURN: Gas treatment that enhances gasoline stability, while reducing the build up of gum and varnish formation
• EASY TO USE: Use one bottle per tank for most effective treatment, additive cleans nearly 100% efficiency in one treatment
• WHY RED LINE: Established in 1979, Red Line products perform & protect better than any on the market no compromises

Red Line

• Reduces friction and wear
• Quiets noisy lifters and valves
• Removes and prevents sludge
• Add to engine oil anytime
• Will not void manufacturer's new vehicle

Rislone

• Lucas fuel treatment is formulated for both gasoline and diesel engines, carbureted or fuel injected
• Use it to pass smog tests. Finally, it totally neutralizes the harmful effects of low sulfur diesel fuel.
• Tan color
• 1 Quart

LUCAS

• Package Dimension : 2.24 " L x 2.24 " W x 7.96 " H
• Country of Origin: GERMANY
• Model Number : 2030
• Item Package Weight : 0.9 pounds

Liqui Moly

• Using Cataclean can lower your total hydrocarbon emissions by up to 50 percent
• Reduces carbon build-up in catalytic converter, oxygen sensors, fuel injectors and cylinder heads which results in improved fuel efficiency
• Improves overall vehicle performance-including driveability issues such as power reduction, hesitation, rough idle, hard starts and lost fuel economy
• Safe for gasoline, diesel, hybrid and flex-fuel vehicles; does not alter fuel
• Not for use in 2-stroke or oil / gas mix engines

Cataclean

• Quickleen For use as needed throughout the boating season
• Aggressive cleaners work to quickly and thoroughly remove carbon deposits from carburetors and injectors, intake valves, spark plugs, piston crowns, and cylinder heads
• Prevents engine knocking and piston seize-up as well as Extends spark plug life
• This product does not contain fuel stabilizers. Use with Quickare to prevent fuel breakdown and oxidation.
• 1 ounce treats 5 gallons - 12 ounce bottle treats 60 gallons

Mercury Marine Mercruiser

• Increase power, performance, mileage and save gas: Cleans by not only the entire emissions and exhaust system, but the fuel system as well. Works with gasoline, ethanol and hybrid vehicles.
• Save on expensive fuel system and emission control repairs: Regular use every 5,000 miles tunes-up the fuel, emissions and exhaust systems keeping them clean and preventing the CEL light from returning.
• Will not void manufacturer’s new vehicle warranty: Specifically designed and safe to use on vehicles which have oxygen sensors and catalytic converters. Exceeds EPA compliance performance criteria.
• Works on all fuel injected, direct injected, carbureted, turbo, GTDI, Ecotec and EcoBoost engines.
• Clean fuel and exhaust systems reduce excess exhaust hydrocarbon, CO and NOX emissions and saves gas.

Rislone

• The Engine Compartment Degreaser, rinse-off cleaner developed especially for car Engine Compartment, Dilute this product 1:10, spray the thinner on the oil and wait for 3-5 minutes, creeps in to every nook and cranny of your bike to thoroughly clean it by the attaced sponge.
• Cleans the entire Engine Compartment. You can have a sparkling Car in as little as 5 minutes, spend more time riding and less time cleaning
• Powerful Formula - The perfect degreaser for removing the toughest oil, grease, mud, dirt, and grime off all of your vehicle engines
• Safely Removes Dirt & Grime - Remove grime on vertical surfaces and other stubborn or hard to reach areas
• Size：20ml/50ml

ErYao

• Easy way to clean and flush the oil systems of gasoline and diesel engines
• Gentle and rapid cleaning
• Neutral to seals and other materials installed in the engine
• Compatible with catalytic converters
• Simple to use

Liqui Moly