Customer Ratings & Reviews

I’ve been using this for about 100000 miles never had any issues. Even sent out sample for analysis. That confirmed it’s good to go.

This is an oil I have trusted for nearly 20 years. Thanks for everything.

My last 2 shipments the oil filter has been opened and exposed due to lack of better packing, top and bottom. This needs to be addressed

I use this in my Kubota tractor in warm weather. Tractor has over 1000 hours with no problems.

Great oil, maintains it's viscosity through all my driving. Easy to order and love the containers it comes in.

I have been using your oil and dual filters in my Tow Vehicles for over 25 years with great results. One 2500 GMC Duramax sold to a friend now has almost 300,000 miles mostly put on towing a travel trailer of some kind with no oil related problems at all.

Purchased this for my son. He always uses Amsoil products in his F-250 and is pleased with their performance.

Seems to be doing very well. There was an audible change in engine noise it sounded smoother and ran happier on my 2019 ram 3500

have been using the 15W 40 Amsoil diesel oil since my 2020 GMC 3500 was new. No oil consumption, changing the engine oil every 10,000 miles.

Comes quick and great oil.

I only use the AMSOIL diesel oil in my truck. At 300,000 miles, I replaced the injectors and when the valve cover was removed, the all of the metal components looked as clean as if the engine was brand new.

Great product for a great price.

I own a 2020 Ram 2500 6.7L Cummins diesel, and I was tired off the dealership. I switched because of Amsoil brand name, and the unbelievable amount of positive reviews. The ordering and shipping were easy and very quick. The product and shipping box were not damaged, hint at another retail shipping giant. I cannot comment on how the oil is working, as it has not even been 500 miles since my oil change. I will buy again and have!

I use this oil for my F350. Life of the oil is great. Keeps my motor running smoothly. Can't ask for better.

The only oil and filter I use in any of my vehicles is Amsoil! This truck gained about 1 MPG after the 1st oil change with Amsoil! To me Amsoil means less maintenance more miles and hassle free service! I order on-line and have it within 3 days!

I used this oil for a Kioti CK2620 hst compact diesel tractor. After changing out the oil the engine definitely ran quieter. My decision to use this oil was based on reading countless entries on light equipment forums and also reviews of many Amsoil users.

I believe in superior lubrication protection for my 6.7 Cummins.

oil test show wear on engine is almost none. Much better than what I used before. Also, the gear lube for my Polaris general has my front and rear differential quiet and clean. Overall I use AMSOIL in every motor on the property.

After speaking with a friend that uses this product, and several mechanics, I use the Signature Series, fully synthetic oil along with a stiction eliminator in my Chevy Duramax. The product has served me well as reported from Blackstone Labs at every oil change.

excellent oil