Customer Ratings & Reviews

This product is perfect for my rotary engine and has been going strong for 30k miles now. It seems to hold its 0w through the cycle and I get great oil pressure.

Purchased new vehicles and all service managers said if I was using Amsoil S.s. They have no issue with oil change intervals. Also at start up regardless of the weather you can tell the engine is smoother at initial start up. Great product!!

Best synthetic oil would not get any other oil thank you Amsoil btw quick shipping as well thanks again

hands down this the best oil, it lowered my idle and engine idle is smoother, only wish it was more available in more retail stores.

The best motor oil I have used.

I always heard that Amsoil was the best out there, so its about time I tried it out. I read a couple of independent synthetic oil reviews that compared Amsoil to other highly respected oils and Amsoil came out on top.

Exelent product.. I need to keep my 2015 Mitsubishi Mirage in good conditions and give it long life.

I use Amsoil lubricants in all my vehicles and I believe they are the best you can buy. I have a Chevy van with 525,000 miles and it has Amsoil products in engine, tranny and rear end. No mechanical failures at all. Hope to get a million miles out of it.

It's honestly the best oil there is i absolutely love it i got my dad hook on it and I did the transmission fluid change everything so much better and smoother and quiter best products im very pleased what I bought.

I love this stuff. Keeps my vehicles running great!

I have used Amsoil since about 1978. It has made a big improvement for me. This Signature series made small mileage improvement, as well as smoother performance. I don't drive many miles a year so I only change my oil once a year, that is in May. When I change my oil it looks just as clean as the new and the filter looks the same. My car is 12yrs. old with almost 37K miles

The Title says it all - Without question this is Hands Down the BEST Motor Oil in the World for any type of Engine! Must be Tough for Amsoil - being the Best type of Motor Oil ever made they have a TALL TASK in front of them and that is “How in the World are we going to make the BEST Oil even BETTER!?” With that being said I want to Thank all the Great People at Amsoil for putting out a High Quality Product in the Age of “Cheap Crap Sells Best” - I know the Amsoil Team will find a way! Now finally I’d like to say, I Care for my Vehicles and know when I use their Oil, Filters, and other Products, I’m getting EXACTLY what I PAID for and it means a lot knowing that QUALITY products still Exist that people can actually stand behind and TRUST !!!

I have been using Signature Series Oil since about 1992. I put it in every car I've owned since then. The last car I owned has over 350000 miles on it and still running. Good stuff!

I’m sold switched from Mobil 1

This is the first time using Amsoil. I don’t put very many moles on the but so far it’s is doing what it was designed to do.

I have used Amsoil for many years now and and my oil gets changed once a year. Great, no compromise, product. It is the only oil that i use

Best performance oil available! Best company support.

Best performance oil available! Best company support.

I have used this 0-20 since I bought my 2008 Dodge Ram 4.7 new. The truck with 84,000 miles stil preforms likel new, with no loss of oil between oil changes.

The only oil I use.