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Gasoline Additives

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P.i. Performance Improver Gasoline Additive

P.i. Performance Improver Gasoline Additive


  • Restores up to 14% horsepower1
  • Restores GDI fuel injectors to 100% flow rate after one tank of fuel2
  • Improves fuel economy
  • Reduces need for costly higher-octane fuel
  • Helps prevent carbon rap
  • Controls pre-ignition knock
  • Compatible with capless fuel systems

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.
2ASTM D5598(M) – 2013 Buick Regal test vehicle.

View Detail Page Warning - Click here for Proposition 65 information for this product

$16.69

Retail Price (USD)
Preferred Price: $12.99
Save: $3.70 Learn More
Upper Cylinder Lubricant

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.
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$5.79

Retail Price (USD)
Preferred Price: $4.49
Save: $1.30 Learn More
UCLCN-EA

$5.79

Retail Price (USD)
Preferred Price: $4.49
Save: $1.30 Learn More
Quickshot®

Quickshot®


Cleans powersports fuel systems
Addresses ethanol-related performance issues
Stabilizes fuel during short-term storage

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$11.89

Retail Price (USD)
Preferred Price: $9.19
Save: $2.70 Learn More
AQSCN-EA

$11.89

Retail Price (USD)
Preferred Price: $9.19
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Gasoline Stabilizer

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

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$15.09

Retail Price (USD)
Preferred Price: $11.69
Save: $3.40 Learn More
ASTCN-EA

$15.09

Retail Price (USD)
Preferred Price: $11.69
Save: $3.40 Learn More
DOMINATOR® Octane Boost

DOMINATOR® Octane Boost


Increases octane up to 4 numbers for improved performance
Maximizes power
Reduces engine knock
Improves ignition & responsiveness
Helps fuel burn more cleanly
Removes carbon deposits

View Detail Page Warning - Click here for Proposition 65 information for this product

$12.39

Retail Price (USD)
Preferred Price: $9.89
Save: $2.50 Learn More
AOBBE-EA

$12.39

Retail Price (USD)
Preferred Price: $9.89
Save: $2.50 Learn More
Motorcycle Octane Boost

Motorcycle Octane Boost


  • Increases octane up to three numbers
  • Maximizes power & performance
  • Helps eliminate engine knock & ping
  • Cleans harmful deposits
View Detail Page Warning - Click here for Proposition 65 information for this product

$5.99

Retail Price (USD)
Preferred Price: $4.79
Save: $1.20 Learn More
MOBCN-EA

$5.99

Retail Price (USD)
Preferred Price: $4.79
Save: $1.20 Learn More
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