Customer Ratings & Reviews

Had a slight hesitation after shifting into 2d gear for the last year. Added bottle to full tank of gas and by a 1/2 tank the hesitation was gone and has remained gone.

I use P.i. every 5000 miles because it's easier to track that frequency on my odometer. I have over 130,000 miles on my 2007 Silverado and have experienced zero fuel injector problems.

Am using this stuff every oil change. Will update as I go

I drive about 5000 miles per month. Once a month I use the PI and can hear, feel the difference.

Adding this is as simple as it gets. My runs like it was new and the gets the gas mileage like it to. A bottle every 3 months works the best for me I'm my Ford Focus. Totally sold on this stuff.

I used this product on my 01 lexus es300 at the begining of this year, and saw almost instant increase in lost power and accelaration reaction time. since then I've used it twice and everytime, Especially when used after or before using quickshot, my car always responds like new and my engine feels clean and responsive. It helps that I use only shell gas as well.

I use this product religiously to keep my fuel system on my 2005 Ford F-150, in the best shape I can.

I used it in the gas tank of my Volvo XC70 to help the engine run smoother, it sounded like water might be their, It works great.

I recommend Amsoil to anyone that wishes to take the best care of their vehicles. All that have tried the products, are completely satisfied, & they have said no other brand of products would be used in the future. Only Amsoil!

PI Performance works great added horse power and increase fuel millage.

I use all Amsoil products in both of my vehicles and have for years now. I will not use anything else in any of my vehicles.

IN CAR, TRUCK, MOWERS

I use this product every six months. My 12.5 year old injectors were perfectly clean after inspection. I'd say it works great.

It works.

The Performance Improver does just that. I have used it in a Kawasaki, three Hondas, and now an Indian. I can't see it working, but I can sure feel it.

Makes a dramatic increase in fuel economy

I've used the products and can only hope they work as advertised and from on-line reviews. Right now the jury's still out.

This always makes the car run more smooth and better feeling acceleration and general improvement overall

Hey! This stuff works! I'm able to monitor multiple points on engine performance as I'm driving. I can see the process of cleaning dirty injectors as I'm traveling down the road, and it does as advertised.

All fuel systems should be cleaned from time to time as preventative maintenance. No matter how good your fuel is your system can get various deposits throughout it thus negatively affecting the fuel systems performance and fuel milage. This product lived up to its claims in my vehicle and will be used as needed in all of my vehicles.