AMSOIL Fuel Additives for Gasoline and Diesel Engines
Start with the problem you are trying to solve: injector deposits, stale fuel, cold-weather diesel operation or off-road octane needs. Then choose the AMSOIL additive that fits.
Find the Right Additive
Start with what the vehicle or equipment needs. These six common situations will point you toward the AMSOIL treatment that makes the most sense.
Clean Gasoline Deposits
AMSOIL P.i. Performance Improver
A concentrated treatment for cleaning deposits from gasoline injectors, valves and combustion chambers.
Maintain Cleanliness and Lubricity
AMSOIL Upper Cylinder Lubricant
An every-tank treatment designed to support injector cleanliness, upper-cylinder lubricity and corrosion protection.
Protect Stored Gasoline
AMSOIL Gasoline Stabilizer
For vehicles and equipment that sit between uses, helping protect fuel against deterioration, gum and varnish.
Treat Diesel Fuel Year-Round
AMSOIL Diesel 4-IN-1 Fuel Additive
An all-season treatment combining detergency, lubricity support, cetane improvement and better cold-flow performance.
Prepare for Cold Weather
AMSOIL Diesel Cold Flow
Helps diesel fuel remain operable in low temperatures and reduces the risk of wax crystals clogging the fuel filter.
OFF-ROAD & RACING ONLYIncrease Octane for Racing
AMSOIL DOMINATOR Octane Boost
A concentrated octane treatment for off-road and racing applications where additional knock resistance is needed.
How I Actually Use AMSOIL Additives
Before getting into every additive category, here is how I actually use these products in my own vehicles, fuel storage, cooling systems, towing setup, and past diesel trucks.
AMSOIL Coolant Boost in My GT500 and Whipple F-150
I use AMSOIL DOMINATOR Coolant Boost with distilled water in both the radiator and supercharger heat-exchanger systems on my track-driven GT500. I also use it in my Whipple-supercharged F-150, which tows the Mustang to the track. For me, it is part of managing cooling-system heat in vehicles that see more load than normal street use.
Diesel 4-IN-1 in My 1991 Dodge W250 Cummins
My first diesel truck was this 1991 Dodge W250 with the first-generation Cummins. I modified its fuel system for more power, so injector cleanliness, lubricity, cetane and dependable fuel performance all mattered. Diesel 4-IN-1 was the practical all-season treatment I used for that kind of hard-working diesel.
AMSOIL P.i. When I Want to Start Fresh
When I buy a used Mustang and do not know the fuel-system maintenance history, P.i. is one of the first additives I think about. My goal is simple: clean up what I can, start with a known baseline, and then maintain the car from there.
Gasoline Stabilizer for Fuel That Sits
I use fuel stabilizer for yard equipment and fuel cans because that fuel can sit longer than expected between uses. For equipment that does not get run every week, I would rather protect the fuel before storage than deal with stale-fuel problems later.
I do not look at additives as magic fixes. I use them when the application makes sense: unknown fuel-system history, fuel storage, diesel maintenance, cooling-system heat, towing load or racing use. The right choice depends on the vehicle, the fuel, the system and the problem you are trying to solve.
Choose the AMSOIL Additive That Fits Your Vehicle
Start with the problem, then choose the product. If you are not sure which additive fits your vehicle, send me a message before you buy.
AMSOIL Gasoline Additives for Fuel-System Cleaning, Storage & Octane Boost
Compare AMSOIL P.i., Upper Cylinder Lubricant, Quickshot, Gasoline Stabilizer and octane boosters for daily drivers, stored vehicles, powersports and racing applications.
Deep-Clean First. Maintain After.
Use P.i. as the concentrated cleanup treatment, then use Upper Cylinder Lubricant for recurring maintenance between deep-clean treatments.
P.i. Performance Improver
Concentrated treatment for removing accumulated deposits from gasoline injectors, valves and combustion chambers. AMSOIL recommends treatment every 4,000 miles.
Upper Cylinder Lubricant
Every-tank maintenance treatment that helps lubricate upper cylinders, maintain injector cleanliness and fight ethanol-related corrosion.
Specialty Gasoline Treatments
Use these products when storage, powersports, motorcycle or racing requirements call for something more specific.
Quickshot
Helps clean fuel-system deposits and address gasoline, ethanol and storage issues in powersports equipment and small engines.
Gasoline Stabilizer
For vehicles and equipment that sit between uses, helping keep gasoline fresh and protect against gum and varnish.
DOMINATOR Octane Boost
A concentrated racing treatment designed to raise octane and help reduce knock in off-road and racing applications.
Motorcycle Octane Boost
Motorcycle-specific treatment designed to increase octane and help reduce low-rpm ping or knock.
AMSOIL Diesel Fuel Additives for Injector Cleaning, Cetane & Cold Weather
Compare all-season and targeted AMSOIL treatments for dirty injectors, low cetane, reduced lubricity, cold-weather gelling and emergency fuel recovery.
AMSOIL Diesel 4-IN-1 Fuel Additive
A practical starting point when you want injector detergency, improved lubricity, higher cetane and cold-flow support in one treatment.
Choose the Diesel Treatment for the Problem
Choose a targeted treatment when you need concentrated injector cleaning, additional cetane, cold-weather protection, or emergency fuel recovery.
Diesel Injector Clean
Concentrated treatment that cleans dirty injectors, lubricates pumps and injectors and helps restore diesel power and torque.
Diesel Cetane Boost
Raises diesel cetane to improve ignition quality, starting, idle quality and available engine performance.
Injector Clean + Cetane Boost
Combines injector detergency, lubricity support and higher cetane in one convenient warm-weather treatment.
Diesel Cold Flow
Preventive cold-weather treatment that improves diesel-fuel flow and helps keep wax crystals from plugging the fuel filter.
Diesel Recovery
Emergency treatment designed to dissolve gelled diesel fuel and thaw frozen fuel filters when preventive treatment is already too late.
Cold Flow Prevents. Diesel Recovery Rescues.
Add Diesel Cold Flow before wax crystals form. If the fuel has already gelled or the filter has frozen, use Diesel Recovery as the emergency treatment.
Choose the Right AMSOIL Additive for the Problem
Start with the symptom, then choose the treatment. Gasoline injector deposits, recurring fuel-system maintenance, stored fuel, diesel cold-flow issues and off-road octane needs all call for different AMSOIL fuel additives.
Use AMSOIL P.i. Performance Improver
Best starting point for accumulated gasoline deposits in injectors, valves and combustion chambers.
Use AMSOIL Upper Cylinder Lubricant
A recurring maintenance additive for injector cleanliness, upper-cylinder lubricity and corrosion protection.
Use AMSOIL Gasoline Stabilizer
Designed for stored cars, trucks, powersports equipment and seasonal engines where fuel freshness matters.
Use AMSOIL Diesel 4-IN-1
A practical all-season diesel treatment for injector detergency, lubricity support, cetane improvement and cold-flow help.
Use AMSOIL Diesel Cold Flow
Use before fuel gels to help improve diesel-fuel flow and reduce the risk of wax crystals plugging the filter.
Use AMSOIL DOMINATOR Octane Boost
For off-road and racing applications where additional knock resistance is needed. Confirm product directions before use.
Use additives as directed. The best fuel additive depends on fuel type, vehicle use, storage time, temperature and whether the application is daily driving, towing, diesel service, powersports or racing.
Shop the AMSOIL Additive That Fits Your Vehicle
Start with the problem, then choose the product. If you are not sure whether you need a gasoline cleaner, diesel treatment, fuel stabilizer, octane boost, or coolant boost, send me a message before you buy.