Customer Ratings & Reviews

I have experienced improvements in performance & fuel mileage.

Nice way to make sure my engines are operating at their best.

Unlike other additives, this one really makes a difference. Another running engine, little better gas mileage and more power.

Bought a bottle for my truck and my car. Not sure I'll buy this again, no noticeable difference in engine smoothness, performance, or fuel mileage. I'm not sure I'll spend the money on PI again

Added this to all my vehicles smooths out any rough spots and cleans

Amsoil PI stopped sluggish cold starts. Great product.

I bought into the hype about this product and signed up. 2 bottles later and there's no true results I can see or tell on my Chevy work truck. Overall I'm disappointed in this product.

So good on fuel and clean injectors.

This product is great for all power equipment and great for your gas engine, so far when I add it to a full tank I get better mileage. I can’t check my spark plugs because they are underneath the intake manifold. I’m sure it’s most likely cleaning those intake valves! I even use it in my JD mower, it keeps the plugs clean!

Good product

This is great for your vehicle and will help it run great all of the time!

Two of four spark plugs had center electrodes worn to double the specified gap, and 1 plug wire was arcing on intake manifold. Check engine light on with OBD2 misfire diagnosis on cyl 4. Looking at the deposits on the plugs I suspected cylinder heads and injectors may have been affected. I am hoping this product removes deposits built up during misfires.

Keeping my injectors clean

If Im going to use a gas additive, its going to be this one

!!!!!

I use TooTier fuel exclusively and after a tank I did notice a difference in throttle response and quieter idle, worth it for regular maintenance

I put this in the fuel tanks of my vehicles when i change the oil and it seems to be helping smooth out the idle.

I put it in the tank very 5,00 mile or so to help keep injectors clean and top end lubricated.

I always add when buying non-ethanol gas for chainsaw, lawnmower and boat. Never have problems related to "bad gas". Excellent product I highly recommend.

I love all Amsoil products