Customer Ratings & Reviews

Product arrived on time as advertised. Quality, ease of pouring and the clear liquid level gauge is a nice feature. The engine seems to like this oil as there is very little engine noise while running.

Have been running the Signature Series 5W-20 in my son's 2015 F150 with the 5.0 Coyote since we purchased it last year with 148,000 miles. Ran the AMSOIL Engine Flush for 15 minutes before our first oil change with AMSOIL because I want the best protection. Seems to run quieter and hope to get another 150K miles, running all fluids on AMSOIL... Signature Series Engine Oil, Signature ATF, Severe Gear for Differentials, Signature ATF for Transfer Case, P.I. Performance Improver every 4K miles, Upper Cylinder Lubricant, Dominator Coolant Boost

Great product and customer service.

I’m running a 2019 Sierra with the 6.2L. My truck isn’t in the recall range, but I still want to have the best oil in it. And my employer pays for my oil changes. I don’t like what I’m reading about the manufacturer’s reasons for using 0W-20/40 in these engines (gas mileage). So I’m using a thicker oil. I’m seeing zero difference in mileage since I switched to this oil, which is good.

After 20k miles still good

I change it every year less than 25k miles and the oil viscosity still good

I use this in every gas vehicle engine I own(5). I change it every 5k with and Amsoil filter & never a mechanical problem.

Works great

Arrived on time, works like it should have no complains.

Just started using in my Toyota Tacoma (very happy) I finally came around on my every day truck and soon my wife's car. I always use Amsoil Z-rod in my old Corvette and think I will be all set now will my oil changes.

On my third oil change since dealer oil change ran out. So far oil still looks good when changing at7500 miles. Light duty and light towing. Mainly highway miles minimal idling.

I started using this oil when my 2016 Silverado was 2 years old. I immediately noticed a difference in how the engine ran. Now, 8 years later it runs as well as the day I bought it

Works great in my 2024 6.4 hemi dodge ram 2500 4x4

When you use the best,your results are the best

1996 Tacoma V6 3.4 4x4, Truck is now 30yrs old and I’ve owned it 6yrs and from day one I switched it over to Amsoil full synthetic. Truck has 292k miles and still runs strong.

This oil is excellent—high efficiency and performance. I recommend it 100%.

Amsoil provides great quality products, always recommend !

Great oil! Great service! I can always depend on the delivery to be quick and accurate.

I've been using amsoil for a couple years now. After I blew my original motor in my 2013 Dodge Ram 1500 Sport pickup. I purchased a new motor and began using Amsoil because the shop that I took my truck to for the removal and installation of new engine provided Amsoil so I said let's use the Amsoil it reminded me of home. Quite honestly watching John Gillespie fishing show is what got me interested in Amsoil he was always promoting Amsoil on his fishing show. Anywho I now reside in Tower minnesota. I'm on my fourth oil change of Amsoil oil synthetic 5w-30. The first couple of oil changes was with a 5000 mile synthetic oil. The last two oil changes have been with 25,000 Mi 5W30 oil synthetic. Honestly I change the oil at 10,000 a little over 10,000. I've noticed a little bit better fuel mileage but definitely more power in my motor so much smoother after an oil change. I will continue to use Amsoil for the life of this motor. Thank you Amsoil for a great product. Sincerely Joey Johnson

Just started using this oil in my 19 Silverado. Hope to beat the AFM that ruins one of the best engines made.