Customer Ratings & Reviews

Great product

Notice I get better fuel mileage. Use my Subaru for package deliveries and I can see the difference in the bank account, less on gas!

I use this product frequently, it gives me peace of mind that the upper components of my cylinder head are lubricated giving longer life to the engine in the long run.

When not using performance improver PI I use this in every tank in between

Once again I find Amsoil to be superior. I have used this consecutively for five months and found that my valves were way cleaner after use, than prior to using this product. If I can see what five months has done, imagine a year of using this product and how it would keep them clean. Thank you Amsoil. I would seriously recommend using this as a preventive measure monthly.

This product I guess is okay. After using in multiple vehicles over the course of several years, do not notice any significant improvement in smoothness of engines or improved fuel economy or performance

Upper Cylinder cleaner, lubricant and performance booster will clean up your dirty valves and make your ride purr like a kitten!!!

I notice a difference in my upper cylinders. There seem to be working a lot better not harder nice products

Can definitely feel and hear the difference with this in my tank

I’m happy with this lubricant

We add upper cyl lube to every tank . Maybe it does its job

This is a great product, the long drain interval is awesome! I’ve been using amsoil stuff for over 20 years, and I couldn’t be happier! Thanks for great products!

Notice lil less noise

Have used upper cylinder lube for sometime now, seems to help with mileage and clean running.

I am now signed up with an account with Amsoil and purchase items online. This all came to be when I spoke with a dealer for the company at a race track this past June. I was at Grandview Speedway in PA at a USAC event and I purchased some product from a dealer. He was very helpful and knew the products very well. I recently bought a case of the upper cylinder lubricant. Some research of the products shows that it is very high quality and also it is made in the USA. I like that I can buy it in bulk at a good price online. The online process to buy products is simple and I will continue to buy from Amsoil in the future.

Talk to a Rep a couple years ago and he suggested I use this product for my hard workin’ engine that is pulling my 5th wheel camper. Being a mechanic all my life and a strong believer in upper cylinder lubricants, I questioned the abilities to do what they claim. After researching and talking to others and seeing the results on Amsoil products, I have been using the upper cylinder lub in every tank. I need to do the best I can to make my engine work the best for me and last the longest for me. I believe Amsoil products do what they say.

$66.11 a 12 Pack Delivered. That's $5.50 a Bottle! (NEARLY A DOLLAR AN OUNCE)????? It's getting to be Pricey here at AMSOIL.... At this point this is the only product that I can just Barely afford to KEEP Purchasing. And it has gone up in Price substantially in the last # of Month's. I think AMSOIL is a GREAT Product, But The Price Point is Getting to be Outta Control, to the Point I may not be able to keep purchasing here. It's definitely a crying shame to say the very least. I use it Every Tank if I remember to Bring a Bottle with me to the PUMP. The Cap seal is still a PITA, but It's gotta be sealed so whatever there. We'll see what happens here, If the Price goes up much more, I'll be forced to purchase elsewhere. And that makes me very SAD. I've been with AMSOIL since 1997!!!! "26" YEARS.... 😎👀.....

Great product for upper cylinder. Tops Lucas.

I use this product on a regular basis. Keeps everything top notch.

I use the upper cylinder lubricant for maintenance at every tank full.