Customer Ratings & Reviews

I bought a 92 500SL that had been serviced every 10K or so for oil changes using Castrol 20/50. I bought it at 67K on the clock, and upon inspection, the engine had an amber deposit all over inside. It Would not come off with solvents. I poured in 10 Qts of the AMSOIL 5/50 into the engine ( factory cooler is huge) 2 yrs and 8600 miles later I had oil analysis done to find a TBN of 6.9 still remaining and 2 PPM aluminum, which was commented on by the Blackstone Lab as unheard of in an aluminum engine. I recently used a horoscope to look inside and up at the underside of the valve cover to see NO amber coloring anymore, just aluminum.

I switched to AMSOIL in my 2017 Shelby GT350 to enhance protection to this unique engine. I wanted a high quality oil that meets the demanding needs of high performance driving. I have been very satisfied with the durability and performance of this product. I have had no oil related issues. I run 3 to 4 track events and regular street driving between events. The car is driver hard and this product seems to do very well.

I own 5 vehicles and a motorcycle, and I exclusively use amsoil products on all of them. This 5W-50 synthetic is been used in my 1400hp motor for over 2 years now with great results!

With this engine oil the exhaust pipe is always clean ...carbon black free . No deposits even after 250.000 km

With this oil ...in winter the engine had no problems starting it was a pro always. My highlander loves it

Best motor oil on the market!

I don't know of any other oil that will save an engine or prolong its life!

The best synthetic oil made....somewhat pricy but worth the extra cost.

I have a 2007 GMC Yukon four-wheel-drive with 230,000 miles. By switching to Amsoil vehicle went from 17 to 20 miles per gallon on the interstate.

Amsoil really stepped up and helped me out. I was one quart short on my previous order, so i ordered another full order for another oil change later to get an extra quart to finish my oil change. I placed the order on Monday and needed the oil by Wesnesday and they delivered. You rock!

We have used AMS oIl in our cars and have had no trouble with them. Will continue to use it

Using this oil in a Mastercraft NXT 20. Engine is a 5.7L MPI ILMOR engine. Simply the best oil I can put in my engine. Fast shipping and delivery!

I’ve been using Signature Series Oil for several years. It is the only oil I use in all vehicles! I have two Tahoe’s approaching 300k miles.

Makes my truck run smoother. I'm sure I'll see 250,000 miles now.

Just bought 2021 tundra ,when i get 5oo mile ,1st oil change with Amsoil 1000 miles change ,3000 ever after.

Hands down the best oil for 4Runners in my opinion. Whether you are in city traffic or over-landing, I’ll bet you sit still and idle for awhile. Just let that sink in a second…….

I have using Amsoil in my all my trucks for years and the just keep going and going and going

This is the only blood I will put in my truck. I plan to keep my truck a long time.

I have been using Amsoil products in ALL my vehicles & now children's vehicles for over 20 years. Best stuff on the market. First experienced synthetic oils in the Navy back in the early 80’s and thought there’s a reason for “mil-spec”. There’s a lot of synthetic oils on the market, yet none that offers superior protection like Amsoil. Living in the southwest where ambient temperatures can reach 115 degrees in the summer it’s nice to know my vehicles lubricants are top of the line.

I run this in all my cars and trucks, best oil on the market