Customer Ratings & Reviews

I just finished my two free oil changes with the dealer and just did my third oil change myself with Amsoil. I changed the oil when the dash indicated I had 50% remaining life and will continue to change the oil at 50% remaining life. I believe GM recommends “Dextros” and Amsoil does not have that term on the bottle however, I believe Amsoil exceeds the GM spec and does not need to pay GM to advertise the Dextros name.

Top Quality oil

Awesome oil for my 2021 6.6 Denali 2500HD ! BEEN USING IT FOR 3 YEARS!! VERY GOOD 💯 MY DIESEL LOVES IT AND I DO TOO.

Since using this product my truck smokes less.

Seems to be good

outstanding protection for all weather condition!

BEEN USING THIS FOR YEARS NOW IN MY 2015 SILVERADO 3500, I LOVE THE PRODUCT.

My Powerstroke diesels run extremely well using Amsoil. First one had 242k on it and is still running great. My son still has it and my second one has 140k on it. Still going strong. Go 10-12k per oil change.

I've been using the Amsoil sig. Series full synthetic 15 w 40 oil in my Duramax turbo diesel engine in 2 trucks I have owned, it is an excellent oil ,wouldn't use anything else ,I recommend this oil

This is the best oil out there

I consistently get oil analysis done on my engine, and since switching to this oil a few years ago I have noticed much better results. If you are in a pinch, it feels less guilty to go a little further as well - also verified by said analysis.

Excellent product

Love thus stuff only thing I use

I’m a believer in the Amsoil product. I’ve been using it for years some people claim that it’s too expensive but when you spend all that money on a vehicle, a little extra on oil won’t hurt.

Been running a readily available brand for years, rhymes with bell. Made the switch on my 2006 Dodge 5.9 Cummins the last service I did and there was an immediate difference. Engine is quieter, smoother, and I have noticed a slight increase in fuel economy. Have since bought Amsoil for my entire fleet (cost isnt that much more) and will be switching as soon as they need serviced. 100% recommend making the switch.

My 2013 Silverado 2500HD Duramax is a “Working Beast” I drive for a Crew of Amish Barn Builders, towing a 30’ Gooseneck trailer with 4 men beside myself. This Signature Series Oil makes my Duramax “ Growl” like a wild Beast. I was a “Purple” fan for decades- I won’t run any other engine oil since I first tried Amsoil Signature Series, at 155,000 miles- It’s still pulling Strong- Thanks Amsoil 👍

Stop offering cheap products for free with purchase. Do better

Wouldn't buy any other synthetic oil in any of my vehicles.

I have use AMSOIL for years. For all my vehicles and equipment. I wish AMSOIL would develop an easy to remove bottle seal. Very hard to remove. Less expensive oil cap doesn't need this silver seal.

I have a 2020 L5P. After using Amsoil on my last oil change the typewriter tick went away. I bought the kit online. Fast delivery on top of everything. Truck runs smooth and sounds great. Amazing product. Definitely buying again