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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"
1Based on third-party testing in a 2016 Chevrolet* Silverado* 1500, 5.3L V-8 GDI with 100,616 miles, using one tank treated with AMSOIL P.i. Actual results may vary.

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Restores up to 14% horsepower1
Reduces need for costly higher-octane fuel
Reduces noise from carbon rap and pre-ignition
Controls pre-ignition "knock"
1Based on third-party testing in a 2016 Chevrolet* Silverado* 1500, 5.3L V-8 GDI with 100,616 miles, using one tank treated with AMSOIL P.i. Actual results may vary.

$13.85
Retail Price (USD)
Preferred Price: $10.65
Save: $3.20 Learn More
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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. And unlike competing fuel additives, AMSOIL Upper Cylinder Lubricant works.
View Detail Page View Full Details Link
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.
$4.95
Retail Price (USD)
Preferred Price: $3.65
Save: $1.30 Learn More
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Special Offers
Free Magnetic Parts Bowl