Customer Ratings & Reviews

I use this product in my truck to keep the fuel system clean works great,,, as all amsoil products do,,, would recommend... 👍

I can confirm that this product works "as advised" on five different vehicles in my driveway. A 2013 Charger R/T, 2015 Charger R/T, 2004 Jeep Grand Cherokee Limited 4.7, 2008 Ram 1500 5.7, 2011 Infiniti M37x. Better MPG (noticeably better), better throttle response, faster, easier starting, smoother idle, quicker, more effortless acceleration and all around stronger running engine in ALL 5 vehicles with just 1 bottle/treatment. I've been using NOTHING but Amsoil in all of my vehicles for over 15 years and I've never had any problems or complaints, just positive feedback to pass along. I'll never change to anything else!

Have used this for years on multiple cars. After running it through one tankful of gas in our current Subaru I can feel an immediate difference in engine smoothness, throttle response and acceleration.

I started using PI several years ago. I had a vehicle with a rough idle, and suspected a dirty injector. After the first use of PI the engine smoothed out. Ever since I had added PI to every fill up just to keep the injectors clean. With the gasolines of today I figure this is a good way to keep the engine running smooth day after day.

Not impressed, shipping was also charged even though i entered the discount code. I suggest you buy gasoline additives elsewhere.

Using the PI Performance improver in my car for over a year. This product has increased performance and given me a smooth ride. Definitely recommend PI Performance Improver.

Excellent product and keeps your car/truck engine with a clean fuel system. Use as directed for optimal results.

Have not noticed any real difference in the mileage factor increase or otherwise when using the PI Performance. I do still purchase to help keep the system clean and at peak performance. My Ridgeline has 140,000 miles and not been tuned up yet for it's first time, because there is no build up on the plugs and she still runs like she always has and the engine is clean due the PI Performance and the Signature Series Synthetic Amsoil used. I would recommend it's use increased mileage or not just as a preventive measure to keep the system clean.

This is no snake oil! I immediately noticed more power and increased fuel mileage in my jeep.

PI makes sure your engine is clean and maintains it's performance. I've had friends use it and notice the marked improvement with just one bottle.

78,ooo miles on my Jeep. The throttle response is like new. I use this as directed and it definitely makes a difference. For the cost, it’s well worth it. Try it and use it as regular preventative maintenance. You will understand.

Don't know if it works. Way to expensive, then put shipping on top of it.

I use PI every 6 months and can really tell the difference in performance of my 2011 Ford F150 5L V8. Engine still purrs because all I've ever put into is Amsoil products.