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  1. P.i. Performance Improver Gasoline Additive - AMSOIL

    Shop AMSOIL P.i.® Performance Improver Gasoline Additive at AMSOIL. Find premium synthetic oil, filters and more online. Fast, free shipping available.

  2. Gasoline Fuel Additives: Shop Gasoline Fuel Additives - AMSOIL

    Shop for Gasoline Additives at AMSOIL. Find the full line of premium AMSOIL products and buy online for delivery to your home.

  3. Customer Reviews: AMSOIL P.i.® Performance Improver Gasoline …

    5 days ago · It has helped clean old gas that has been in the tank for a few years in storage. I noticed the difference when the tank runs low and I fill up with regular gas, the engine doesn't feel sluggish …

  4. Do fuel additives work or are they a waste of money? - AMSOIL Blog

    Apr 13, 2022 · AMSOIL P.i.® Performance Improver is a potent, deep-cleaning gasoline fuel injector cleaner featuring concentrated detergents that aggressively clean stubborn, power-robbing deposits …

  5. The One-Two Punch: AMSOIL P.i.® and Upper Cylinder Lubricant

    Nov 9, 2023 · 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 …

  6. Fuel Additives: Buy Fuel Additives for Cars & Trucks - AMSOIL

    Shop for Fuel Additives at AMSOIL. Find the full line of premium AMSOIL products and buy online for delivery to your home.

  7. How to Clean your Gas and Diesel Fuel Injectors - AMSOIL Blog

    May 15, 2025 · AMSOIL P.i. Performance Improver gasoline additive contains concentrated detergents that aggressively clean stubborn, power-robbing deposits from injectors, valves and the combustion …

  8. The Dynamic Duo: AMSOIL P.i. & Upper Cylinder Lube

    Oct 16, 2019 · We recommend using AMSOIL gasoline additives throughout the life of your vehicle to preserve like-new power and efficiency. If you choose to use gasoline additives, consider the …

  9. AMSOIL Upper Cylinder Lubricant Corrosion Inhibitor

    While AMSOIL P.i. Performance Improver is designed to attack and remove stubborn injector deposits that can reduce power and fuel economy, Upper Cylinder Lubricant helps preserve injector and …

  10. AMSOIL P.i.® Performance Improver Gasoline Additive

    Most Amsoil products do a job that you can usually feel but PI was disappointing. It cost more than many similar fuel cleaners but you won’t notice any difference.