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

I use it in my duramax. It has 275k all original.

Great stuff it Amsoil! highly recommend

AMSoil “UCL” makes them purrr. No more sounds. Buy a case. This stuff is awesome.

great product for fuel treatment and cleaning.

Best

Great product for any engine!

I'm taking their word that it works but really don't have a clue if it really does anything or not.

Not sure if this is a high octane product, the car feels faster when used, and back to normal after a tank of gas. Feels the engine is running smoother.

I have been using Upper Cylinder Lubricant for two GM 2.4L GDI Engines with great results. One engine is approaching 120K miles, the other 100K miles. Neither has had issues with injectors or carbon deposits that typically build up on pistons and affect low tension piston rings.

I love all Amsoil products, they're high quality products, I've been using for 20 years now, my cars are lasting forever. Thank you Amsoil.

I started using this on my new 2021 Gladiator once per month but couldn’t really notice anything. After about a year, I upped my usage to every fill up. Still didn’t notice much of anything. Discussed with my gearhead mechanic buddy and he said it was probably overkill but couldn’t hurt as long as I wasn’t using low quality gas. So I stopped using it for some months and that is when I noticed that the engine just seemed to run rougher or not as smoothly. I decided to restart using the stuff and almost immediately noticed the smoothness return. It’s definitely doing something and I’m not having to skip meals to pay for it so I will continue to use it at every fill up.

We like the product and use it at every fill-up. The one downside is the foil seal is hard to remove, with no pull tab.

I have been using this gas additive every fill-up in my Jeep since it was brand new, and I put a bottle of the P.i. Performance Improver Gasoline Additive in every oil change. Amsoil has never let me down. I'm a firm believer in all their products.

Love this product works great in my vehicle.

If you have a direct inject engine, this is a must to have any hope on keeping it running smoothly. It simply works, what else need I say!

My car already runs quiet and smoothly , but since I've been adding this product at each fill up , somehow it made my engine even quieter. I think it's doing what it says it will do , and quieter means less friction , so I'd definitely recommend it. You really can't go wrong using Amsoil products , and I've only had great experiences.

Makes the idle smooth and lubricates good

As advertised great product.