Customer Ratings & Reviews

Your car feel thank you using this product!

Removes all the impurities from the gas.Vehicle runs smoother.

Great FI cleaner. Cleans combustion chambers and keeps your vehicle running new.

I use this in my 2013 2500 HD GMC and have had no fuel related problems in 160,000 miles.

I am always a little apprehensive about performance claims on things you cannot physically see or test for. This product defies that... I decided to switch to Amsoil everything on our 2015 GMC Acadia and said what the heck I’ll try this out too. After using it once my 3-4 crank start ups went back to the factory fresh 1-1/2. Went on a family trip that usually uses 1-1/2 to 1-3/4 of a tank and this is where it got really good, went round trip on 1 tank!!! Highly recommended this, can’t say the frequency, but at least once a year. Good stuff!!!

Haven't used this product long enough to give it a honest review, but if it is as good as the other Amsoil products then its a good product.

Love this product. Within a day can feel the improvement in power. Makes my Durango R/T roar.

Very pleased with results

Good stuff for the keeping the fuel system fairly clean. I use it about twice a year, or every 4k miles on all my vehicles.

ALL AmsOil products are excellent, better than any comparable brands 👍🏻💪

Works great.

I have been using this product for years, keeps the fuel system in our 2015 Prius V and 2013 Lexus CT200H in excellent condition. Both cars average 40 to 43 MPG consistently, around town and interstate driving. I highly recommend this product to all who are serious about keeping their cars in top performance condition. I go above and beyond Amsoil's recommended usage, I add one half a bottle every other month to keep the fuel system clean and in top performance.

I highly recommend. Though I'm not sure how clean it makes things in the engine, I can tell you for sure that you notice something from the first bottle you put in. I use a bottle of this at the first fill up after each oil change.

I use this a couple of times a year in all my vehicles to clean my engine. I usually add it before a long trip on the road to get a good cleaning. It's hard to say but it seems to keep my engine running good.

I started using PI when I bought my 2001 GMC that has an 8.1l engine. I does help to improve the gas mileage on my truck. The 8.1 was not built for mileage but for towing. PI does improve the gas mileage. I highly recomend this product.

As with all AMSOIL treatments, this one is no different - it's a must-have for any gas automobile. I use one bottle in my Grand Marquis every 3-4000 miles and my mpg's stay between 19-20 in town (which is 2-3 mpg above the EPA's average estimate for the little 4.6L). 28-30mpg on the highway at 70mph. YEAH. Of course, every fluid in my car is AMSOIL, from differential to engine oil to coolant. I run Sig series 5W-20 with an EA011 filter every 10,000 and I use a WIX 46814 air filter (nothing special in terms of air flow). I also have a coolant filter with the Donaldson P554685 filter running AMSOIL HD coolant. With all of the positives of my AMSOIL-fan-boy tendencies, it really is the best stuff on the market for keeping your engine in tip-top shape. But buyer beware, if you're going to use any fuel treatment from AMSOIL (including the diesel treatments, which I use on my 6.0 - which also runs like a top), have a Swiss Army knife to help you open the lid. The child safety mechanism doesn't work and it's impossible to open the lids without either cutting the lid off or using a pair of channel locks to vise it off. And of course, there is a foil tab underneath the lid that is also very hit-and-miss. I've found that out of a case of 12 (of any fuel treatment), at least 3 of the safety tabs under the lid are defective. They either leak in the box (wasting the precious fuel treatment) or are impossible to remove without a tool (which is counter to the pull-tab design).