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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
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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$16.69
Retail Price (USD)
Preferred Price: $12.99
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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
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Preferred Price: $4.49
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UCLCN-EA
$5.79
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Preferred Price: $4.49
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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
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AQSCN-EA
$11.89
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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
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Preferred Price: $11.69
Save: $3.40 Learn More
ASTCN-EA
$15.09
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Preferred Price: $11.69
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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

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$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
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Motorcycle Octane Boost
Motorcycle Octane Boost

  • Increases octane up to three numbers
  • Maximizes power & performance
  • Helps eliminate engine knock & ping
  • Cleans harmful deposits
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$5.99
Retail Price (USD)
Preferred Price: $4.79
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MOBCN-EA
$5.99
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Preferred Price: $4.79
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