Customer Ratings & Reviews

This is a great product, the long drain interval is awesome! I’ve been using amsoil stuff for over 20 years, and I couldn’t be happier! Thanks for great products!

I have only used this product 1 time so far. I did not notice much of a difference at first but by time I had used 1/2 tank of fuel I noticed my vehicle more responsive when I stepped on the accelerator and by time I had burnt 3/4 tank of fuel my mileage become notibily improved

Run this in all of the vehicles. Never had any issues.

I used PI for the first time after an oil/filter change at 107k. I was amazed that I actually could feel the power and the fact that my gas mileage increased by 10%. This stuff really works.!!!

I have used this additive since Jan. 2015… Clean smooth performance, and improved optimal mpg😊👍

I have been using all AMSOIL products for past 20 years. I have 3 cars with over 400000KM … still going strong. Dependent on AMSOIL.

MPG’s went up so that means it worked. Very happy with this product, will be buying more soon.

I won't change your oil if you don't use this product at least once a year, preferably before every oil change. It only makes sense to clean your fuel system and everything else for that matter before changing your oil and filter. Dirty fuel injectors contaminate engine oil. This product really works and I have photos to prove it. I recently removed the intake manifold on my friends 2005 BMW 325i with over 300000 km's on it with the check engine light on forever, I couldn't believe how clean the intake valves were that a photo was required, he used P.I. before every oil change for over 5 years.

I COULD NOT TELL THE DIFFERENCE IN PERFORMANCE AFTER USING THIS PRODUCT. I WILL USE IT AGAIN.

Like my AMSOIL engine oils they have a great reputation, so I gave this gas treatment a try. After a couple of days I noticed better performance and gas millage in all my vehicles, also if you compare prices on what you get, you can't beat AMSOIL.

This product works as described. Car had a little bit of a rough idle at 86k miles. Ran this through the tank and after a couple of fill ups, the idle has smoothed out and the engine is running strong.

Us this in our gas engines, have never had an injector problem.

Great result from using this. After half a tank I noticed a significant improvement in response and acceleration. plan to use once a year from now on.

I am using this additive in a 2012 Cadillac CTS-V Sedan, with the 6.2L Supercharged Motor that I purchased 7 months ago. I'm ALWAYS a skeptic when it comes to additives, but was convinced to try it by one of the YouTube Influencers that I follow, Legit Street Cars. The Caddy has 100,000 on it and appears to have been taken pretty good care of. I put this additive in it at EVERY oil change, which for me is between 3-4,000 miles. I can definitely tell the difference in performance when it's in the tank. My HOPE is that it is cleaning the way it states it does. I feel it is, as the oil the first time I added this, was pretty black, meaning I felt it was definitely cleaning. Subsequent oil changes have seen a lighter used oil color than the first time. If a person really wanted to test this, they should do an oil analysis before and after some of the subsequent oil changes. For now, you have a believer in me. Anything that assists a factory 556 h.p. motor gain a pony or two is a friend of mine!

Love the product i will buy more .

I have used P.i. in my Toyota Highlander (156000) and Toyota Tundra (88000) since they were new. Add a bottle every 5000 miles. It maintains optimal fuel economy and I’ve had zero fuel injection problems. Excellent product!

Twice a year. Maintenance.

I use this once a year and I feel it does help the engine run smoother.

Engines with direct fuel injection eventually have carbon buildup on the engine head and valves. These lead to a loss in power and fuel efficiency. I have 35k miles on my 2.0T Honda Accord Sport and could already notice that the car doesn't pull as hard as when it was new. Did some research on AMSoil P.I. and decided to give it a try. Wow! I can already notice the difference in engine performance with the PI! The engine runs smoother and pulls harder with 87 octane now than 91 octane before adding in the PI. I'll be using PI on a regular basis to hopefully keep those carbon deposits from building up. I spent hundreds to manually clean out the carbon buildup on my previous VW GTI. It's much better and affordable to use PI on a regular basis than to pay for a heavy manual deep cleaning of the engine head.

I try to use a bottle at every oil change. It improves my fuel mileage. I also use some Marvel mystery oil at every other fill up.