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Gasoline Fuel Additives
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Shop the AMSOIL online store for our gasoline fuel additives - engineered to restore peak performance, reduce emissions and deliver improved fuel mileage.

P.i. Performance Improver 
Product Code: APICN-EA
P.i. improves fuel mileage an average of 2.3% and up to 5.7%. Reduces emissions such as hydrocarbons (HC) up to 15%, carbon monoxide (CO) up to 26% and nitrous oxides (NOx) up to 17%. Restores power and performance. Reduces the need for costly higher octane fuel. (API)
Upper Cylinder Lubricant 
Product Code: UCLCN-EA
Your engine’s top-end is sparsely lubricated and prone to the development of performance-robbing deposits. It’s also highly susceptible to corrosion, an issue compounded by the prevalence of ethanol in today’s fuel. AMSOIL Upper Cylinder Lubricant is designed to solve those issues. Its AMSOIL-exclusive, powerful formulation helps maximize engine power and performance while increasing engine life. And unlike competing fuel additives, AMSOIL Upper Cylinder Lubricant works.
Quickshot®  
Product Code: AQSCN-EA
Premium fuel additive formulated to thoroughly clean and restore peak performance in small engine and powersports equipment fuel systems.
Gasoline Stabilizer 
Product Code: ASTCN-EA
Reduces the oxidation process that occurs when fuel is stored for extended periods to prevent the formation of varnish and sludge which can clog injectors, stick floats and cause poor engine performance. Ideal for stored seasonal equipment such as snowmobiles, lawnmowers, motorcycles and boats.
DOMINATOR® Octane Boost 
Product Code: AOBBE-EA
Maximizes power and improves performance in all two-cycle and four-cycle gasoline engines. Increases octane up to 4 numbers. Reduces engine knock, improves ignition and engine response, helps fuel burn cleaner and inhibits corrosion. Recommended for off-road and racing use.
Motorcycle Octane Boost 
Product Code: MOBCN-EA
Increases octane for power and efficiency. It is designed to improve startup performance and eliminate engine ping and knock for increased power at low-rpm operation. Contains detergents that help combustion chambers and fuel delivery systems maintain cleanliness for optimum performance.
SAVE UP TO 25%

$10 for a six-month membership
Save up to 25% on Every Order
Exclusive promotions and more
FREE SHIPPING

Order $100 or more in AMSOIL products at full retail prices and receive free ground shipping anywhere in the continental U.S.