Customer Ratings & Reviews

Works great

Use this in both our vehicles every oil 5k oil change with Chevron top tier fuel. Keeps fuel system clean.

Amsoil's product offering is extensive because they understand that different applications require different solutions. I run PI in my wife's 2024 Telluride (which does A LOT of idling), my 2019 F250 and my 2023 Street Glide (burning off all those EPA-mandated crankcase nasties). The results are not immediate, but I've seen an reduction of carbon deposits on the tops of pistons and valve stems. One bottle ever third full tank on the cars, and a third of a bottle every third tank on my SG.

I put it in and o noticed the tank lasted me longer.definitely saw the difference in my truck

Ran two tanks with the product and injector cleaner works great

I very rarely leave product reviews, but this one deserves a review. I have 4 vehicles (mine, my wife's, and both of our kids), and 3 of them were bought as used vehicles. So far, I have run 2 bottles through each of the vehicles, and I have noticed a marked improvement in idling, acceleration and gas mileage. My younger son's vehicle had the best improvement. He has a 2018 Subaru, and after 2 bottles of Amsoil he went from getting 18 mpg in the city to getting 22 to 23 mpg in the city, along with much better acceleration and smoother idling. It was getting about 21 to 22 mpg on the highway, but I haven't tested that yet since using Amsoil, although I'm positive it'll be much better now. Additionally, I used 1 bottle, so far, in my mom's 21 year old truck. It idles much better and accelerates much faster and smoother than before. I haven't calculated the gas mileage usage yet, but I'm sure it's better as well. For the past 36 years, I used 2 other very well known fuel additives every oil change, and I did quite a bit of research before buying Amsoil. After the improvements I've seen in 5 different vehicles ranging from 2005 to 2026 year models...I will ONLY use Amsoil every oil change.

Nice product! Its works!

Again these Amsoil products have absolutely blown my mind! They seriously do exactly what they say the products actually do! One bottle in my 2020 Ram 1500 Bighorn Hemi Etorque with 105’000 miles and it seriously has new life! It has its umph again! No more hesitation on the pedal at all, I will use it as instructed from this point on !

Went from maybe 17 mpg to 18.5 after using this product.

Applied the Amzoil Gasoline PI to a 2015 Subaru Forrester 2.0L Turbo, and after one tank noted a smoother idle and what feels like an increase in power. Very pleased with the product.

This great product also does an amazing job of keeping the ports clean and will prevent the buildup of residue in the engine!

I add Performance Improver to a full tank of gas in my 2017 Toyota 4Runner about 2 a month. I believe it is keeping my injectors clean and it improves my gas mileage.

The Absolute Best Fuel System Cleaner in the Market!!!! Helped to quantifiably improve gas mileage and I assume clean the fuel system components as well!!! HIGHLY RECOMMEND!!!!!!

I use P.I. In all of my gas powered equipment. Seems to really work well with keeping things clean and stable.

With the worsening quality of fuels getting delivered these days, to keep your fuel system running clean, and prolong your engine life, use this!

I use this every oil change to maintain the fuel injectors. It keeps the fuel mileage optimal so I know it’s working. Great product.

Great product have had zero fuel issues

Great product

I use it once a year. My garage queen sits for extended periods and this product protects and cleans my fuel system for optimal pergormance

I like the performance it gives my engine & will be ordering more soon