Fuel Additive · AMSOIL stock no. APICN-EA
P.i. Performance Improver Gasoline Additive
P.i. Performance Improver Gasoline Additive is an extremely potent, concentrated detergent additive — unsurpassed in removing damaging fuel-injector, intake-valve and combustion-chamber deposits. It cleans your entire fuel system and restores power and performance in one tank of gasoline, and it's excellent for direct-injected (GDI) and port-injected engines. Treats 30 gallons; use every 4,000 miles.
- Deep-cleans the entire fuel system — injectors, intake valves and combustion chambers — in one tank.
- Restores power, performance and fuel economy; helps reduce emissions.
- Excellent for gasoline direct-injected (GDI) and port fuel-injected engines; capless-compatible bottle; E85-safe.
Our vehicle lookup doesn't currently match this product to a Toyota or Lexus position. Check your owner's manual or ask us.
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Your next step
- Confirm the fit. Open the vehicle list above and match your year and engine.
- Check the product page. Capacity, what it does, and the AMSOIL claim basis.
- Order from AMSOIL. Use any Buy link: it opens AMSOIL.com and credits Tuned Yota. Preferred Customer pricing is available only through registration; it is a paid membership.
Frequently asked questions
What's the difference between P.i. and Upper Cylinder Lubricant?
P.i. is the deep-cleaning additive — it cleans the entire fuel system and restores like-new performance every 4,000 miles. Upper Cylinder Lubricant is the maintenance product — it lubricates upper cylinders, fights ethanol corrosion and keeps injectors clean at every fill-up.
Can I use both at the same time?
Yes — both products can be used together in one tank of gasoline. Deep-clean with P.i. every 4,000 miles, keep clean with Upper Cylinder Lubricant every tank.
Do these work in my Toyota or Lexus?
Yes — they're formulated for all gasoline engines, including the direct-injected and turbocharged engines across the Toyota and Lexus lineup, and they're compatible with E85 and capless fuel systems.
Where can I buy P.i. Performance Improver Gasoline Additive?
Online from AMSOIL through Tuned Yota, an Independent Authorized AMSOIL Dealer in Lakeville, Minnesota: every "Buy" link on this site opens the product on amsoil.com, and the order ships from AMSOIL. Preferred Customer pricing is available only by registering as an AMSOIL Preferred Customer. You can also call (612) 406-7117 or email info@tunedyota.com to order through us.