Customer Ratings & Reviews

I have always used PI as a preventative solution to combat combustion deposits and a fuel system cleaner. Must be working as I have not had a fuel issue in 15 years.

Put it in a full tank and truck ran smooth idle smooth and just great results, highly recommend

I noticed the difference the first time I used it about a year ago. Give my engine better performance.

Truck runs better increased mileage great product.

I've used this product for a couple years with all my vehicles. I use it and run it through right before an oil change to make sure everything is clean as possible when the oil is changed out. Have had no issues with this, and pleased with results.

Great feel additive using all my cars

I am glad Amsoil has this additive for the gas, Performance Improver is exactly what it does, hands down.

I add this awesome product went from 37 mpg back up to 40.5 mpg on my 4th tank of gas now and it's staying in the 40mpg range 2017 Toyota Corolla 83,000 miles

Second time using PI. Fuel economy always goes up during and after its use. I add to tank at each oil service around 5K miles.

The PI does a good job at cleaning your fuel injectors and the heads in general.

Yet another good product by Amsoil

I used this product in my Nissan Murano and after buring about a 1/4 tank of gas. My motor ran quieter and it was quicker when accelerating and my mileage has increased by about 4% and I am loving it

Worked well in both 2014 Silverado and Honda

I’ve used this product for years in an ‘06 Tundra and ‘09 CRV and vehicles continue to perform as new. Highly recommend using this at least twice a year.

Performs just as it should.

I’ve been using AMSOIL products for more than 20 years in every car I’ve driven in that period of time and I’ve never had a major mechanical problem of any kind. My current personal vehicle, a Ford Explorer with more than 111,000 miles on it is showing no signs of wear. I will never use any product other than AMSOIL.

Great product and value. My mechanic advised that my valves were cleaned and better engine performance after using this product.

I’m usually pretty skeptical of some additives but after seeing how well it worked in my Harley and gator I’m convinced this stuff is worth the investment. I use it in all my gas engines now

All around impressive stuff and easy to use just wish it had a reminder sticker when to add the next batch. Other than keeping track odometer and writing down the mileage it’s a no fuss for win for you and your vehicle. Will for sure be using when needed again.

When I received the package the side of the box was wet with no signs of damage. When I opened the box it was obvious one of the bottles had been dropped and was leaking. You would think there would be some sort of quality control when it come to shipping chemicals. About a 1/3 had leaked out. Should have called but at the time I was to busy.