Customer Ratings & Reviews

The PI Performance Improver made my Lexus GS350 and Toyota Camry feel/run smoother. I use a bottle after every oil change. Highly recommended!

I use this before very oil change just to keep things cleaned up in the fuel system...works great would recommend as I would for all there products...you want the best then use the best amsoil...

So I have been cheating and using amsoil 100/1 outboard oil to do the same thing for years. It reduced oil consumption in 2 honda cr-v's and the mileage is up slightly in all our vehicles. Great product

Poured the bottle in and no more hesitation in the throttle. Took the truck through the mountains of West Virginia and Kentucky and it never struggled to maintain speed. So far, I'm a believer!

This is another quality I am is all your product that you should use his part of your maintenance on your vehicle! You will notice a performance increase not only in power but gas mileage is well!

I used this product in a 01 Toyota 4runner limited with 87k miles. I have never used an additive before in this vehicle. After going thru a tank of gas I can happily say that I noticed a big difference in acceleration. I would recommend this product.

Good product this with new oil and filter have got my vehicles running smooth.

Improved gas mileage and performance. Will use regularly from now on.

I've been using this for over a year now. It has improved the way my truck runs and starts. My truck is 21 years old and since using this, it starts right up and has quicker and more crisp throttle response. It brought new life to an older engine. I highly recommend using this product if you have an older engine. I'm positive it would keep a new engine running at peak performance as well.

PI had been a product we’ve been careful to keep on our shelf. We believe it makes a big difference in the performance of our vehicles. We don’t use it on every fill up but usually every 3. May not need it but the engine seems to run smoother with it. Would I recommend this...absolutely.

Effective gasoline additive that smoothed acceleration. Good product.

My wife's tahoe was getting in the hundred thousand mile range..started noticing some power loss...truck is right back to how it used to be

Used this on several occasions in someone's vehicle that is not normally a maintenance upkeep kind of person with cars. After the first time I put it in their vehicle, they were buying a bottle for their neighbor because they couldn't believe how well it worked. Three bottles layer they still request I put it in their tank to improve their mogs.

Great product. I use every 5k miles for simplicity.

Switched from using other products to all Amsoil a few years ago, could not be happier with the performance gain.

Read reviews online and publications from Amsoil, but after searching various forums where I knew information would be as unbiased as possible I decided to try this. I used it in three different vehicles, 2001 Land Rover Discovery (4.0 V8 160K), 2008 Chevy Tahoe (5.3 V8 157K) and 2015 (3.5 V6 40K) Jeep Wrangler. Each had different results. The Land Rover immediately idled smoother. It is a torquey but low HP motor so performance seemed about the same. Nonetheless, definitely smoother across the board. The Tahoe had been idling a bit rough prior to use and everything had been cleaned up as much as possible following a head removal for lifter fix recently. I suspected injectors since I knew there were no other vacuum leaks or issues. This truck was the one that triggered the search for injector cleaners to see what the market looked like. By the end of the tankful it idled almost like it did when I first got it and it got REALLY quiet when at idle. Mid to upper RPM full throttle pulls felt MUCH stronger. 3500-5000 RPM it pulls hard now. I forgot how strong this engine was. Smooth since then two tankfuls ago. The Jeep didn't change much. It had been running mostly fine, but it was the one of the three that I noticed white smoke from much like a direct injection of cleaner through an intake. Despite being the lowest mileage of the group it gets the most city driving and start and stop as well as slightly longer oil change intervals. I suspect it built up a relatively high amount of carbon for age. I've tried products in other vehicles and this appears to be the only one where I've noticed differences beyond the placebo effect. Like most Amsoil products it is not "cheap" but whatever cleaners they put in this it is VERY concentrated. Injector cleaning and carbon removal seem substantial. I wish I would have put a borescope in the cylinders just to see what it did exactly. I would recommend.

Use at every oil change. Cleans injectors. Engine runs smooth. You can tell if you do not use it. Better mpg. It just works plain and simple.

My car seems to have more power when I'm running this in the fuel and I never have fuel related problems with injectors.

I use every 5,000 miles. Helps keep my old jalopy run like new.

Every time I buy an oil change, I always buy fuel treatment. Works well.