This is the first car I’ve used this. Not sure how it’s going to work.

After putting this in my car after it's sat for 6 months during the winter and I drove it back home. It was great

Use every other tank, I found my car runs just as good on top of tank as the bottom so keep tank above 1/2 tank, if they want me to use every tank make smaller bottles. Car seems to be responsive when needed. Didn't seem to get better mileage but I have kind of lead foot. Neck seems to have problem opening inside flap on capless system at times so takes a little effort to get in tank without making a mess.

I put this product every oil change. Highly recommended by other AT4 owners.

I’ve owned 3 GM pick up trucks but my last one I purchased in 2019 I drained the motor oil out at 500 miles and I filled it up with Amsoil 0W20 Signature Series. I have about 71000 miles on my 6.2 L Sierra and every time I use the Amsoil Upper cylinder lubricant I feel a difference for the better and I think my MPG gets slightly better. It is a great product and every 4000 miles I follow up with P.I. Performance Improver gasoline additive. My 6.2 L motor is more happy and I enjoy my truck so much more. I’ll keep purchasing the Amsoil products.

This is an excellent fuel additive. I consistently use this for every fuel tank fill-up. Together with Performance Improver, this is a great combination to fight against Ethanol.

Love amilsoil products been running them in all my vehicles for 5+ years!

Cleaned up the rough idle and lugging on my motorcycle in higher gears. Make sure to use a whole tank or as low to empty for the best results!

I use it on every fourth fill up.

Used this in my F150 and it seems to have improved performance. I will continue to use it.

I seemed to notice once I added this it seemed to run alittle smoother

Worried about valve train issues on the motor in the 2016 GMC SIERRA 1500. When in fuel saving mode. Added this product regularly. 40k km later and engine is strong

This stuff is awesome, been using every tank of gas.

I use Amsoil Upper Cylinder Lubricant in my Direct Injected Subaru Crosstrek as well as my Mitsubishi Mirage and 3/4 ton Chevrolet (which don't have direct injection). It seems to be doing a good job of keeping my fuel injectors clean/ engines running efficiently. **I find that their Upper Cylinder Lubricant provides good protection between treatments using Amsoil PI. Upkeep is key and so I've been using this on my vehicles since they were new. Idling and throttle response are good with all engines.

Worked as expected from a Great Company!!

I use this with every oil change along with the performance improver and use the engine flush about every third oil change engine always is clean and never Burns any oil that's saying a lot for a Subaru

A good in between treatment after using the P I improver

I use this product in everything that has an engine. Side by side, truck, car, generator and snow blower.

With a recent tuneup and cylinder exam it was obvious even with 120,000 miles . The cylinder area was cleaner now than it was at 70,000 miles another winner from Amsoil !

first time i used this product so the jury is still out