Customer Ratings & Reviews

There is no better oil for prolonged use, especially in conjunction with the Amsoil bypass filter. I just change the 20 micron filter every 8000 miles, and the oil at 24000, or sometimes more

Great product- Best protection and extended oil change- once a year!

I’ve used this product in a 6.0L powerstroke where it made the truck run smooth as could be. Allowed me to extend my drain intervals, as I ran OTR with it and was doing 10k miles a month. I currently use it in my 6.7L powestroke where it does a phenomenal job with all the idling and towing. Being in North Dakota I love the cold weather protection!

Best diesel oil I can find!

I have been using amsoil in my 2008 F250 powerstroke for years and with 220k on the engine with a tuner. Engine still doesn't burn oil after all this time. Great product and will continue to recommend it to others.

Not a true quart of oil first off. Secondly in the L5P Duramax This oil creates the type writer tick. The Mobile1 I was running didn’t. Not impressed with the over priced oil that doesn’t seem to do it job regardless of what they claim.

I have used Amsoil products for years with great success, putting hundreds of thousands of Km of trouble-free driving with no oil consumption or any evidence of wear

For many years I have been using Amsoil Synthetic 5W40 SS Diesel Oil in all of my Equipment, Trucks and Cars. I use it in both diesel and gas engines. I like the long intervals between oil changes. Some of my engines are old. They are lasting a long time and are keeping clean inside. I use this oil in both winter and summer. My car does not have a block heater and it will start in temperatures of -30 C.

I am a mechanical engineer with 36 years experience and will use nothing but Amsoil products in my vehicles. If you want to keep your engines running for a long time you want the best lubricating oil possible. All tests reveal Amsoil synthetic oil and filters are the best. Even performance shops like Banks Power recommends Amsoil products!

I’ve tried others but none performed as well as Amsoil in my 12 valve Cummins. The truck has 265k miles on it and Amsoil stays clean longer and reduces oil consumption over the oil change interval.

I have been using this oil for 3 years and I love it no problem the motor sounds different and performs better.

I just started traveling full time pulling a 5th wheel. I wanted to use a good oil so in my research determined Amsoil was one of the best Synthetic Oils I could buy. So I’m giving it a try. My truck has 212,000 miles and I’ve had no problems but with those miles I wanted something better than average to protect my engine so I went with the Amsoil.

Amsoil definitely makes the best oil on the market and has the test data to prove it. I use their oil, filters and fuel additives in both my vehicles. Their diesel fuel additive cut the regen frequency by more than half on my 2020 duramax. Highly recommend all amsoil products.

Works very well, used to use a different Amsoil product switched to this for the added wear protection and the extended drain intervals

This is the only product I use in my super duty 6.7L

Great product been using it for years on my 6.7 cummins. The best

The truck seems to run and sound better. MPG has increased 10%. I'm also running the all in one.

I have been using Amsoil for several years and have recommended it to other people that are extremely pleased with this product, we will continue to use Amsoil products and are pleased with the performance from Amsoil products, thanks Amsoil.