AMSOIL Gasoline Additives are the best gasoline additives for maximizing power and restoring peak performance in gasoline engines. You can feel confident knowing that your car is running at its peak performance thanks to our high-quality products. Your engine will run smoother with better horsepower. Check out the full line of AMSOIL gas additives, gasoline stabilizers, and octane boosters.

AMSOIL P.i. Performance Improver Gasoline Additive is formulated to deliver increased horsepower by removing deposits and restoring lost horsepower up to 14%. Using Performance Improver Gasoline Additive reduces the need for costly higher-octane fuel, controls pre-ignition "knock" and reduces noise from carbon rap and pre-ignition.

AMSOIL Gasoline Stabilizer keeps fuel from deteriorating during storage for up to 12 months, allowing easier startups. Gasoline Stabilizer is ideal for all two- and four-stroke engines, including motorcycles, snowmobiles, boats, ATVs, edgers, tillers, mowers, cars, trucks, snowblowers, chainsaws, generators, and farm and construction equipment.

AMSOIL Upper Cylinder Lubricant preserves horsepower and performance. 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.

AMSOIL Quickshot® helps prevent water-induced ethanol separation and breakdown. AMSOIL Quickshot® is designed for use in all two- and four-stroke gasoline-powered engines, including motorcycles, snowmobiles, boats, ATVs/UTVs, edgers, tillers, mowers, snowblowers, chainsaws, generators, and farm/construction equipment.

AMSOIL DOMINATOR® Octane Boost significantly increases engine response and power in all two- and four-stroke gasoline-fueled engines by increasing octane up to four numbers. Just one treatment reduces engine knock, improves ignition, and helps fuel burn cleaner. DOMINATOR Octane Boost is the recommended octane boost for all high-performance off-road and racing applications.

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.