Customer Ratings & Reviews

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.

I use this very often in my truck and wife's car. Works great!!

Used it in my Nissan pickup works great.

This item does what it says it will do my 07 Ford Sporttrac 4x4 V8 runs so much better with 293,000 miles on my truck .

Provided a noticeable boost in performance and helps to run more efficiently

I'm using it on my cars. so far so good.

It adds power to my car you have the best product at a great price

My 2004 Wrangler 4.0 (150,000 miles) began to experience valve clatter during start up. Since it was time to change the oil again, I thought I would try the Performance Improver. 15 minutes idle then change the oil and filter. Valve clatter is gone. Plus, my average mileage jumped up from 15 mpg to 16+. Wasn't expecting that, but I'm not complaining.

All my vehicles use this every compel of months and keeps the engines run smooth