Customer Ratings & Reviews

I noticed a slight ticking in my valves on my 2013 F150. After adding this to a tank, the ticking went away.

This product is exceptional! It really does what the say it does. I love these products from Amsoil!

I’ve used others! But with this product, I can actually feel a difference!

Used this for the first time and immediately noticed a quietness and smoothness while the engine was running.

I had a lifter or two ticking in my high mileage 4.2 l engine in my F150 pickup. After one bottle no more ticking.

My cars start faster and get better fuel mileage

Helps a lot with the mileage And the performance

Use it every couple of tanks of fuel

I have been around Amsoil products most of my life. They are number 1 in lubrication as far as I am concerned...

Engine is running better. Will try any of Amsoil’s products I can.

I’ve been using it weekly in my car over the last 2 years.

I use this product every fill-up of gas because I notice a better idle and better MPG.

don't know the science behind it but it keeps my pistons running

I put a bottle in every tank full of gas because it adds about .3-.6 MPG in my 2018 5.7 RAM. To me if it's adding lubricity enough to add MPG's it should add extended life to the engine as well!

Great product but bottle needs better functioning lid.

Great product. Use it every fill up. Cheaper than store bought products. Only issue is the opening of the seal. Sometimes the tab pulls off and you have to use a finger to break the seal. Seal needs to be made like performance improver so the solvent doesn’t get on your hands. Great product other than that.

I use this on long bike trips when the temps are high to help keep the top end of the engine lubricated. I add 1.5oz to a tank of gas (5 gal) maybe every 2 or 3 tanks. About 1 bottle every 8 to 10 tanks of gas.

I always use it in my vehicles

Run at 100% Run at Full Throttle!! After Amsoil’s Performance Improver does the Tough Job - Cleaning up the inside of your Engine and Fuel System, from the Fuel Pump to the Injectors - The Valves to the Piston Head and Combustion Chamber - Now it’s time to keep it all Lubricant to prevent wear scars from forming and the fuel pump running smoothly with less strain on it’s internal components. Your Engine’s Top End has little to no help in terms of Lubrication, however we can fix that, with this simple Fuel Additive at Fill-up you’ll be running smoothly and prolong Engine Life!

Works fine in my Camry hybrid