Customer Ratings & Reviews

I've used this oil for a while now and all I can say is I love it. My truck runs smoother and doesn't burn oil when I'm pulling.

I purchase this oil for the soot contamination, fuel economy gains and the wear additive package. I can tell my Duramax doesn't "tick" anymore and the fuel economy is much better. I can also go longer between changes. All in all a great product.

excellent

Great oil I run amsoil in everything

Swapped my Duramax diesel over to this oil. I want this vehicle to last for years so I am going to use the best oil I can. I plan on doing oil analysis as well to get the most out of this product.

Can't be more happy with the oil I've been running it for almost 10 years your missing out on the quality of this oil if your not using it

Engine runs quiter and seem to get better fuel mileage. Very happy with the oil product.

I like this oil in my 99 ford power stroke. Holds up well.

I have four dodge diesels and a cat powered welding machine and I run this oil year round with zero issues. I do oil changes every 25000kms.

I use this oil in my 2014 Dodge Ram EcoDiesel. Amsoil updated the oil from 5W-40 to 10W-40 based on Dodge recommendations. Great oil.

Under heavy usage and need peace of mind

Use this oil in a tow vehicle never loses a drop of oil in 5000 miles

Although I've never use this oil before I'm confident I'll love it as I've been useing it in my M/c for years ! You just can't go wrong with amsoil!

My engine is still running and since I can't see inside it, it must be working.

It kept the engine cool. It doesn't break down.

My mileage increased a bit. The engine runs a lot smother. I plan on keeping my truck for many years and this oil is go to oil.

Dumped class 3 synthetic rosella t6 for a true synthetic class 4 PAO Amsoil Sig Series 5w-40. Turbo Diesel is running smoother, quieter, cooler and 2-3 mpg boost! Worth the money!

I was a Royal Purple junkie since it was the only synthetic available to me where I live and got it free. It worked great in my gas truck and other gas vehicles. I switched to Amsoil since I purchased a diesel truck and became a Preferred Customer. Really like that part !!! The truck runs much better and accelerates better than the Ford oils that were in it and oil change at 25,000 miles is a nice $$ saving feature. I will switch to the new synthetic 5-40 on the next oil change and then extended changes past 25,000 would be nice. I monitor all things done to my truck and log it. Put 9,000 mikes on the truck in less than 4 months and excellent results !!!

Best lube oil for my one ton Ram 3500. But not without the Amsoil EA filter.

I use 15 40 in any vehicle I have which includes my tractors, lawn mowers.