Customer Ratings & Reviews

Do your research. It's hands down the best motor oil.

Amsoil gives my high performance truck the protection it requires. When I’m hitting speeds of 120mph on the track!

I have been using the signature series since it came out without any problems on four different vehicles. -I stared using it in 2010 with my 2002 Mercury Sable. After running it for one year I had it tested, not with Amsoil, it came back perfect so I stated using it on my other vehicles. I sold it in 2014. -1999 Ford F150 now with 188,000 miles. I used AmsOil starting at 500 miles then switched to the signature series starting in 2011. -2008 Navigator 44,000 miles in 2014 now with 110,000. -2008 MDX 97,000 miles in 2017 now with 155,000 miles. All will be getting their yearly April AmsOil oil change. I do have to add about 1/2 - 1qt. of oil about 6-8 months after the oil change.

Been using this oil for 8 years, changing every 10,000 miles, very good oil, no problems.

I have used Amsoil in my vehicles for many years have never had a engine failure while using Amsoil. Before I retired I had a oilfield service and my trucks (Ford's) would run 200,000 miles before they would be parked.This is after being worked very hard . I use it still in all my personal vehicles.

My engine now idles right where it should and at a stable and steady pace. I did pair this with the AMSOil Oil filter so increased flow rate helps as well.

Great product. Most of the 260,000 miles has been on Amsoil SS. Some on Mobil 1. And some on Valvoline Full Syn. Gets better mpg on Amsoil.

I've got almost 200,000 on my Ford Edge and zero engine trouble. Love this oil.

Good produc

Amazing oil! Well only use this in my 5.7 hemi

I used to use Royal purple until I did my homework you can't beat amsoil 5w50 for my car feels great

I had just purchase a new Truck and was looking to protect my investment. after looking at 3 party reviews their was no oil that came close to Amsoil testing in all categories. I have a Eco Boost engine and my oil is also use to lubricate the Turbo,s bearings and engine, you need an oil that can take the heat and still provide you protection. Get your motor the Reliability your family needs because they are counting on you.

Very happy with results and the fact I can go 1 full year between oil changes.

Excellent motor oil, engine idling is smooth, highway driving gets even better engine response and start up during cold mornings is 100% dependable.

love my amsoil, not sure how long I am going to be able to use it due to the cost

What a great product, I have been using Amsoil for years, and I love it!

Great motor oil

My motor is quieter running with this oil in the crankcase. I even think I got a little bump in gas milage too. Great oil

Top quality product that I have used for years.

I have said it before, I will not use anything other than amsoil in any of my machines. Longevity and specs Proves this oil to be superior.