Customer Ratings & Reviews

This stuff after 4 tanks made my old clapped out civic feel like it had another cylinder and boosted the gas mileage by 5mpg.

I give my BMW S1000XR a splash with every tank. It keeps the fueling flawless, mile after mile.

Not how the directions say but I usually put a few oz in with each fill as a maintenance dose. I usually buy nonalcohol top tier gas which means it has a good amount of cleaners added at the blender. I drive my daily drivers over 300,O00 miles and so far no O2 or fuel injection problems. Fuel pumps usually last about 200,000. I drive my dailies over 300,000. Also have '54 inline 6 with 6V points ignition. Plugs stay clean for 10,000 miles which is my replacement interval.

seems to work as listed.

Use it mainly to keep the injectors clean for a smooth HP 2017 5.0 Coyote. Appears to do just that. No negatives!

Put this in before a long constant mph drive, big difference in mpg for a new V8. Good for the recommended interval.

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.