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​Shop for AMSOIL Pi, Upper Cylinder Lubricant, Gasoline Stabilizer, DOMINATOR Octane Boost, Motorcycle Octane Boost and more

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P.i. Performance Improver Gasoline Additive
• Restores up to 14% horsepower1
• Reduces need for costly higher-octane fuel
• Reduces noise from carbon rap and pre-ignition
• Controls pre-ignition "knock"​
Upper Cylinder Lubricant
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®
• Cleans powersports fuel systems
• Addresses ethanol-related performance issues
• Stabilizes fuel during short-term storage
Gasoline Stabilizer
• Helps keep fuel fresh up to 12 months
• Protects against varnish and gum buildup
• Fights ethanol corrosion
• Ideal for stored seasonal equipment such as snowmobiles, lawnmowers, motorcycles and boats
DOMINATOR® Octane Boost
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
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.
AMSOIL P.I.® PERFORMANCE IMPROVER GASOLINE ADDITIVE

AMSOIL P.i. is a potent gasoline performance improver with concentrated detergent that aggressively cleans stubborn, power-robbing deposits from injectors, valves and the combustion chamber. Effective in port and direct injection systems. Bottle compatible with capless fuel systems. Cleans entire fuel system in one tank of gasoline. For use with cars and trucks. Treats up to 30 gallons. Add entire bottle to tank at fill-up. For best results, clean your fuel system with P.i. every 4,000 miles (6,400 km). Do not use with diesel or two-stroke engines.

MAXIMUM DEPOSIT CLEAN-UP
  • Helps keep valves clean and moving freely.
  • Aggressive additives attack the most common forms of engine deposits and limit their effects.

REMOVES FUEL-INJECTOR DEPOSITS
  • P.i. removes deposits and keeps injectors functioning as they should.
  • Testing shows P.i. restored GDI fuel injectors to a 100% flow rate after one tank of fuel.2

RESTORES HORSEPOWER
  • Third-party testing demonstrated performance of P.i. using a 2016 Chevrolet* Silverado* with 100,616 miles on the odometer.
  • Following a single treatment with P.i., the truck measured an incredible 14% improvement in horsepower.1
AMSOIL Pi Fuel Additive
CLEANS COMBUSTION CHAMBER DEPOSITS
  • Fights combustion chamber deposits to help restore power, control knock, increase fuel economy and reduce the need for higher-octane fuels.
  • Protects against compression loss, difficulty starting and rough idling.
  • Reduces possibility of "carbon rap," when deposit buildup causes the piston to hit the cylinder head.
  • Decreases the possibility of pre-ignition "knock" or "pinging."

CAPLESS-COMPATIBLE BOTTLE
  • Bottle is fully compatible with capless fuel systems.