These fuel additives work together to help keep your vehicle running at peak power and performance.

Carbon deposits and sludge can build up over time, leading to losses in horsepower, performance and longevity. But AMSOIL P.i. and Upper Cylinder Lubricant can thwart those issues with a fierce one-two punch against deposits and sludge. P.i. gives engines an aggressive deep cleaning. Upper Cylinder Lubricant keeps engines clean while lubricating vital components in the top end. Together, AMSOIL P.i. and Upper Cylinder Lubricant provide a comprehensive system to help keep engines running in peak form.

AMSOIL P.i.

AMSOIL P.i. attacks carbon and sludge buildup head-on with concentrated detergents that aggressively clean stubborn, power-robbing deposits from injectors, valves and the combustion chamber. Third-party testing demonstrated the performance of P.i. using a 2016 Chevrolet* Silverado* with 161,926 (100,616 miles) km on the odometer. Following a single treatment with P.i., the truck measured an incredible 14% improvement in horsepower.¹

P.i. restores GDI fuel injectors to 100% flow rate after one tank of fuel.² It helps keep valves clean and moving freely; helps protect against compression loss, difficult starting and rough idling; improves fuel economy and helps restore power and performance. AMSOIL P.i. reduces the possibility of both “carbon rap,” when deposit buildup causes the piston to hit the cylinder head, and pre-ignition “knock” or “pinging.”

Treating your engine with AMSOIL P.i. every 5,000 kms can help your engine maintain horsepower and performance.

AMSOIL P.i. is effective in one tank of gasoline. Simply add the entire bottle to the tank at fill-up and let it go to work.

AMSOIL Upper Cylinder Lubricant

AMSOIL Upper Cylinder Lubricant helps preserve and build on the gains made by AMSOIL P.i. It maintains cleanliness, particularly in the all-important fuel injectors, lubricates the under-lubricated top end of the engine and fights ethanol-related corrosion. That’s important because an engine’s top end is sparsely lubricated and prone to the development of deposits. It’s also highly susceptible to corrosion, an issue compounded by the prevalence of water-absorbing ethanol in fuel. Upper Cylinder Lubricant features an AMSOIL-exclusive, powerful formulation designed to solve those issues.