Customer Ratings & Reviews

Left for Florida pulling 25ft RV. Put 2 bottles in the 36gal tank. I can't prove any improvement but it never missed a beat in 1450mi

2008 4X4 GMC Sierra 6.0 VortecMax. 129,000 miles I’ve use this fuel treatment since first oil change. I use it every oil change. Truck was delivered new with 4 miles. No engine problems. No injector issues, during spark plug change at about 100,000 miles plugs looked new. Chemical make up seems to have all the desired ingredients for a fuel treatment and I haven’t experienced anything negative as a result of continuous use.

I recently purchased this treatment just to get my order to $100 for the free shipping and glad I did. Very noticeable performance. My truck felt great. I will be using this every oil change for now on.

After one bottle of this miracle magic, the 4.7 V8 runs even better. A bottle of this every 3-4 tanks of fuel makes this 4.7 V8 purr like a kitten.

I use this product anytime I fill with non-top tier gasoline and for all road trips regardless of fuel quality. In a time of complex engines and higher operating temperatures, this product adds additional protection to the engine in my humble opinion.

i have used Red Line and Amsoil Pi for my Mazda 3 and Amsoil Pi came on the top. Excellent product highly recommended little expensive to get in Canada but worth every penny.

Been using it for a while and it works great been consistently getting better results with it used as recommended super fast shipping and easy to use

Works well. Keeps the fuel system clean.

Used it, very impressed

I have been using this is my 1/2 ton farm truck and wife's 16 Tahoe. It really cleans and have noticed it neutralizing the fuel. My fuel trims and changed and a big notice in my alcohol content is way better. I have also noticed we do not have to complete intake cleanings near as often. Helping with carbon build up. We have noticed a slightly better fuel milage. This has slowed the demand for "fuel tank evap as well". Again, THANK YOU AMSOIL.

Love all the Amsoil products

I've used PI for almost a decade now and as far as I'm concerned, its one of the best products AMSOIL makes. While I use it with my cars - and if you start using it early in a car's life, it's going to help keep it from having fuel injector problems - I also use it with small engines. I have a 30AMP generator that wouldn't start at all. I had used fuel with ethanol in it before I became aware that could cause issues. After multiple attempts to start the thing, including using Power Foam in the carburetor, no dice. I figured I'd have to take it to a shop for repairs, but I decided to put in PI with some ethanol free gas and amazingly, that generator cranked up. Shut it off and started it again the next day, no problems starting. Put a half bottle of PI in there with non-ethanol gas and it ran until it was out of fuel. That was 7 years ago, and that generator hasn't given me an ounce of problems starting/running since, including during the Texas deep freeze of 2021 when we lost power for 3 days in sub-20 degree weather. It ran for ~ 55 hours pretty much nonstop. Not going to say PI is magic or a cure for bad maintenance/operation but it worked for me.

Great product running it in all of my vehicles. Noticed a big difference in the performance of my vehicles. Used to use a different product, now I'm team Amsoil for sure.

I can see a difference after using

I’ve been using Performance Improver for years, currently my 22’ Toyota & 2013 Honda. Improves gas mileage & gives you an engine boost.

I have using it for a while , it does the job

Definitely a notable difference in my 2016 F350 6.2L Flex Fuel. Affordable, quality product that works!

Fuel Mileage increase is noticeable. Lasts a few tanks after.

I always use this on my last empty tank 20 gal fill-up before changing my 2013 Silverado 6.0 gasser's oil. I also use it along with the Upper Cylinder Lubricant too at the same time with good results. I definitely notice my truck running smoother for a pretty good long while afterwards. Give it a shot!

As the product cleans during the tank of gas usage, gradual improvement in performance is noted and definitely is noticeable after running the entire tank of additive containing fuel through. I haven't calculated the actual mpg increase, but it has definitely helped.