Customer Ratings & Reviews

If you use your truck as a truck and not a grocery getter this is the oil I would recommend. This oil holds up good under heavy towing a cool off times. The lower grade heavy duty started breaking down very fast and only got about 10k miles on it before I noticed oil pressure fluctuations , but this max duty is much better for higher temps and hard working trucks.

I feel, and most of my friends feel the AMSOIL IS the finest oil on the market. I guess it is what you could call a reference oil, an oil that every other oil manufacturer strives to be like. I've used them all but I have come to trust only AMSOIL. I use their products in all of my vehicles and machinery both diesel and gas, oh....and also my guns.

Great oil! Switched my 2009 Peterbilt with the ISX Cummins from mobil delvac 15w-40 to this. Noticed right away that I had less vibration from the engine while sitting in the cab. The oil stays cleaner longer also. I also started running this in my 2008 Silverado 3500 with the Duramax.

The oil I requested for my 2014 Ram/ 6.7 was delivered on time and well packed with no damage . This is the second time I’ve purchased from AMSOIL and will continue in the future . Highly recommend them !

The product speaks for itself

I was fortunate to grow up around Amsoil and the benefits of using it I wouldn't use anything else it's the best oil hands down!

This 5w40 diesel oil have great protective qualities, and actually made my diesel motor quieter. Due to superior lubrication.

My 2014 Ram Eco Diesel hums with Amsoil. I have gained in gas mileage and my truck warms up quicker. Love this product - it’s worth the extra $ - invest in your vehicle.

Great Oil I would not use any other brand in my Dodge Cummins!

Great oil doesn’t break down

I’m just going to keep it simple,your not going to find nothing better then this......Amsoil #1

My son uses it in his 2004 dodge truck. Highly recamends it.

I use this in my 97 Dodge 2500 12 valve cummins, and my 2006 F450 6.0 powerstroke. I never have to add oil to either one between oil changes. No issues using this oil.

Best diesel oil on the planet period!!!

My son has run it in his dodge diesel for several years does a great job. I run a amsoil in both of our vehicles for many years won’t run anything else.