Customer Ratings & Reviews

Folks, this Synthetic Oil is simply the best manufactured oil money can buy. If you care about protecting your investment, while using the best product in the market, then look no further.

I have not done a legit full break-in for the motor I am rebuilding. Only did 100 miles running time with regular driving using break-in oil for now.

The best synthetics Period,

I was using royal purple and was using a quart between changes. I switched to Amsoil and it stopped. I will only use Amsoil now

The best oil on the market but, overpriced.

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.