SUV at a gas station at dusk with the fuel nozzle in its open filler door, the fill-up moment for AMSOIL fuel additives

AMSOIL Fuel Additives

Fuel system cleaners, stabilizers, cetane boosters, and cold-flow treatments that restore lost performance in gasoline and diesel engines.

AMSOIL fuel additives

Buy AMSOIL fuel additives for gasoline and diesel engines, including P.i. Performance Improver, Quickshot, Gasoline Stabilizer, Diesel Cetane Boost, Diesel All-In-One, and Cold Flow for winter operation.

Buy online, or save up to 25 percent on every order by joining the AMSOIL Preferred Customer program for $20 USD per year. For local pickup, the where to buy AMSOIL guide covers the AMSOIL Dealer locator and how to find AMSOIL near you.

Order AMSOIL Fuel Additives Online

Add an AMSOIL Preferred Customer membership to the same cart to unlock up to 25% off qualifying products. Existing members can sign in, and qualifying orders currently over $100 can ship free.

Fuel Additives

Compare the full lineup below, then use the AMSOIL online lookup guide to confirm the formula and viscosity that fits your application.

AMSOIL Quickshot Gasoline Treatment and Stabilizer staged in a fuel system service area

AMSOIL Quickshot® Gasoline Treatment and Stabilizer

AMSOIL Fuel Additives

AMSOIL Quickshot is a concentrated gasoline treatment built for two-stroke and four-stroke powersports engines.

AMSOIL Diesel 4-IN-1 Fuel Additive staged in a diesel truck shop

AMSOIL Diesel 4-IN-1 Fuel Additive

AMSOIL Fuel Additives

Also marketed as AMSOIL Diesel All-In-One, is a year-round diesel fuel treatment that pairs detergency, cetane lift, lubricity improvement.

AMSOIL Diesel Cetane Boost Fuel Additive staged in a diesel truck shop

AMSOIL Diesel Cetane Boost Fuel Additive

AMSOIL Fuel Additives

AMSOIL Diesel Cetane Boost (ACB) is the standalone cetane number improver for diesel engines that need higher-cetane fuel than the pump provides.

AMSOIL Diesel Cold Flow Fuel Additive staged in a diesel truck shop

AMSOIL Diesel Cold Flow Fuel Additive

AMSOIL Fuel Additives

AMSOIL Diesel Cold Flow (ADD) is a concentrated winter cold-flow improver for diesel fuel.

AMSOIL Diesel Injector Clean Fuel Additive staged in a diesel truck shop

AMSOIL Diesel Injector Clean Fuel Additive

AMSOIL Fuel Additives

AMSOIL Diesel Injector Clean (ADF/ADFP) is a concentrated diesel detergent fuel additive built to clean modern high-pressure common-rail injectors.

AMSOIL Diesel Injector Clean + Cetane Boost Fuel Additive staged in a diesel truck shop

AMSOIL Diesel Injector Clean + Cetane Boost Fuel Additive

AMSOIL Fuel Additives

AMSOIL Diesel Injector Clean and Cetane Boost (ADS) is a concentrated diesel fuel additive that combines the detergency.

AMSOIL Diesel Recovery Fuel Treatment staged in a diesel truck shop

AMSOIL Diesel Recovery Fuel Treatment

AMSOIL Fuel Additives

AMSOIL Diesel Recovery (DRC) is an emergency diesel fuel treatment that dissolves the wax crystals that form when diesel fuel passes its cloud point.

AMSOIL DOMINATOR Octane Boost staged in a performance race shop

AMSOIL DOMINATOR® Octane Boost

AMSOIL Fuel Additives

Racing-grade fuel additive built for high-compression, turbocharged, supercharged, and high-output two- and four-stroke gasoline-fueled engines.

AMSOIL Gasoline Stabilizer staged in a fuel system service area

AMSOIL Gasoline Stabilizer

AMSOIL Fuel Additives

Long-term fuel-preservation additive built for seasonal vehicles, powersports machines, marine engines, and small power equipment that sit idle between uses.

AMSOIL Motorcycle Octane Boost staged in a motorcycle workshop

AMSOIL Motorcycle Octane Boost

AMSOIL Fuel Additives

4-ounce, motorcycle-specific octane booster formulated for four-stroke air- and liquid-cooled bikes.

AMSOIL P.i. Performance Improver Gasoline Additive staged in an automotive workshop

AMSOIL P.i.® Performance Improver Gasoline Additive

AMSOIL Fuel Additives

AMSOIL P.i. is a concentrated detergent-based gasoline performance improver formulated for port-injected and gasoline direct-injection (GDI) engines.

AMSOIL Upper Cylinder Lubricant Corrosion Inhibitor staged in a fuel system service area

AMSOIL Upper Cylinder Lubricant Corrosion Inhibitor

AMSOIL Fuel Additives

Gasoline fuel additive engineered to restore the lubricity that ethanol-blended pump fuel takes away, defend top-end engine surfaces against corrosion.

Maximize Engine Performance with AMSOIL Fuel Additives