Customer Ratings & Reviews

After use one bottle in each vehicle I have noticed our engines running a little smoother. Very happy.

I've used PI both as a maintenance product (every 4,000 miles) and as an emissions passer (annual NY state inspection). Works as advertised.

Made a huge difference even after the first treatment.

Similar to the upper cylinder lubricant, this stuff is a great fuel additive. I've also used it in three vehicles and the results are amazing. Regain in HP and smoother idle are easily noticed as well. Highly recommend.

IT WILL CLEAN YOUR ENGINE LIKE NONE YOU HAVE EVER USED

Incredible product! Lives up to its description in every way.

Been using this gasoline additive in my 2011 Honda CRV every 3000 Miles and works great. Take care of your car and it will take care of you.

I use it right before a long road trip

Use it and you will start to believe that not all oils and products are made the same

I used this product second time on my 2009 toyota rav4 with 260, 036 miles. I feel significant difference in acceleration, responsiveness and economy. M gonna continue to use and you should try it.

This product has significantly improved my gas mileage in my vehicles. I am a amsoil beleiver and csnt wait to get more amsoil products in my vehicles.

This is the only fuel treatment I've used that gives immediate benefits. When my wife's RAV4 was hesitating / lurching, one bottle cured it. (Probably fuel buildup on throttle body?)

Good stuff....use it in all our cars

I use P.I. In every machine I own, this product actually cleans the carbon off the valves. I use my borescope to look at the valves when I change my spark plugs. Even the top of the piston is cleaner every time I check them.

I Use every 4000 miles to maintain optimal fuel mileage and engine performance in all my vehicles.

I have used this on my 2003 Liberty with the 3.7 and it has worked wonderfully, I do a lot of highway driving as well as a decent amount of city driving and have seen as much as a 2MPG increase since I first put this fuel system cleaner in. Definitely does what it advertises to do.

Had issues with a gator running rough, this took care of the issue

I run the Performance Improver through my gas engines at least a couple of times a year. It is another Amsoil product that I trust to keep my vehicles running great.

This stuff is amazing. Keeps our cars injectors clean and have seen close to almost 2mpg better mileage after using it

that is right. MPG increase from 27 to 30, more quiet. I like this staff.