Customer Ratings & Reviews

Increase MPG when added. I usually add in once per month, but it seems to have a positive effect on MPG for at least 2 or 3 tanks. I put in all 3 of my vehicles.

Helped with idle along with PI additive

Keeps my vehicle running great

If you do a little research into Cafe standards and what is missing in fuel you will want to use this. Not all fuel has the amount of needed additives for today's direct injection engines, you want to keep those injectors clean and the rest of the upper cylinder too. I have a 2.4 cylinder turbo boxer engine 2025 Subaru, it really needs this. In practice terms I see a bit more pep in my step with this but not as much as with Amsoil P.I. I think every task is too much but every other tank should be just fine as I only allow a tank to go to 1/4 full and then refill. The bottle handles more than my tank holds so should be good to go.

Helps quiet the noisy GM lifters. Helps smooth out the ride. Just as good as the in-store 30 buck cleaners.

This product is added at every fill up. I also use the AMSOIL P.i.® Performance Improver Gasoline Additive at the recommended intervals. After a short time you will notice a huge improvement in performance! If your engine uses direct fuel injection, which can cause a Carbon buildup, you have to try it!

I use this at every oil change. Does the job.

This product used with every tank of top tier gasoline combined with PI Performance (every oil change) makes me confident my 23 4runner will always be in tip top condition.

Great product, love recommending it.

Im very satisfied with the upper cylinder lubricant . I use in my 2020 Qx60, 2010 GMC Sierra and my favorite 2011 Nissan Maxima . Totally satisfied with results thus. Car notes not in my future.

I started using this product about 4 tanks of gas ago. It cannot be hurting, but I’ve noticed no loss or improvement in mpg.

I use upper cylinder in between using P.I. on our vehicles. it helps to just keep things internally cleaned. its a small price to pay for a little added cleaning. its easy to use just dump it in while putting rewards codes and credit cards in gas pump and then fill up after it.

We have three vehicles I maintain. Part of our maintenance is Amsoil upper cylinder Lube - every fill up. One 6 ounce bottle treats up to 25 gallons. Our vehicles have fuel tanks ranging from 15 to 18 gallons. We generally refuel at 1/4 tank. Lets call that around 12-13 gallons. I see no value added double dosing. This product needs to be made in 4 ounce size. Love the product. I believe it is effective. I just hate the package.

Have been using this additive for all my vehicles by far the best fuel treatment around, my 2007 GMC Sierra just passed 210,000 miles and runs like a Top A+++

I can say I can't tell using it but I hope it's working. I will say they need a easy tear top on it as it's a pain to get off as is. That's why the 4 star.

This is a must fuel additive at every fill due to the "oil dry" area of the upper cylinders. The only time I would not use it is when running a PFI based cleaning additive.

It does what it says it does

Noticed immediate results after pouring a bottle of this product in my GMC Sierra 5.3 with GDI.The solvent with in this product must have cleaned out the injectors that spray directly into the cylinder that get fouled up with this type of fuel delivery system. This is now a must in my maintence regiment. Amsoil you got a great product in your inventory👌

The addition of one bottle of upper cylinder lubricant with every tank of gas is an easy maintenance practice which should keep your engine running (like mine) for over 300,000 kms without problems. I also use the PI additive when going on a long trip and the two together really seems to make a difference. Here's to the next 300k!

It's inexpensively priced to do preventive maintenance on your injectors and all other stuff fuel related