Customer Ratings & Reviews

I've been using Amsoil signature oil in all my vehicles for years and just switch from another Synethic oil that the dealer used in my 6.7 Cummins. It has excellent oil properties and provides excellent lubrication under extreme -25c weather up tp 40c we experienced in summer hauling. For my money it provides that extra assurance and piece of mind.

My engine was the first component on my new 2020 Ford F450 that got changed out to Amsoil. I do my own service work and when I finished the oil change including the Amsoil filter, I started my rig up and couldn’t believe how much quieter the engine sounded. That same day I ordered all of the Amsoil required to change every component on my truck. My transmission is running about 20 degrees cooler in a hard pull and the transfer case and the front and rear differentials noise level also dropped. I also gain about 2 miles per gallon in fuel consumption. This is going to be my last rig I buy as I will be retiring soon, I’m going to make sure it gets the best care to make sure.

I have used other diesel oil in my trucks, suvs, tractors, back holes and even some cars. I have found that amsoil performs better then almost all the other brands. I just know that out of all the oils I have used amsoil works better in all condition I have run into. The price of the oil cost as much as the rest of the diesel oils it just holes up better and amsoil oil filter cleans oil better. I have been using amsoil for over thirty years and still like it.

The Amsoil Synthetics are so much better ,I get outstanding results using there Synthetic Oils . The 5W-40 Synthetic Oil for the Diesel engine is the best to use all winter, the engine starts easier in winter months and runs cooler engine Temps even in the summer hot days . There Synthetics provide easier starting in the cold days of winter as well as keeping all engine parts running easier ( Less Friction ) on those cold days and less friction and less heat build on the warmer or hotter days of summer . You can see lower engine temps in the summer when running , less friction on those metal parts means better mileage and less wear . I like all there Amsoil synthetic oils and greases. If you're not using the Amsoil Synthetics your wasting your money on the other oils you should be using there Synthetic Oils at Amsoil and seeing the difference it makes on your equipment by running better their Synthetic Oils are much slipper on all metal moving parts .

used in three trucks oldest an 01 with 275k purrs like a kitten

Using Amsoil motor oil for years,always count on the quality

So far I really like the oil. , it seams to be staying thicker

Great price

This product performs as advertised and tested. The engine starts easily in cold weather; it runs cool in hot weather. It protects the engine against excessive wear. I am a happy customer after using it in two different diesel engines.

Best diesel oil on the market...!!!!

Very good oil 15W40 SS Diesel oil is all i run in my duramax trucks.

Amsoil is the only brand I run in my vehicles and with extended drain intervals and proven results it’s a no brainer.

I love this oil. Have been using it for a long time. I have a 2005 Dodge 3500. My mileage went up to 23+ miles per gallon. Up 3 MPG. I don't drive as much since retired, so I change oil once a year. This is excellent oil for any diesel.