I can not give a review on any oil with very few miles on the vehicle I'm using it in. Get back to me in about !00,000 miles or about 6 or 7 years.

High quality oil at an affordable price, definitely recommend to my friends and family. Preferred customer program is awesome too!

This oil works great and I like getting it delivered

The oil more than meets expectations and being rated for 25k miles or 1 year is amazing on its own! Being that I drive this vehicle less than 6,000 miles a year, I guess I will be doing the annual oil change! So far, the motor seems to idle and run smoother and not stay in the high pressure state as long! I will definitely buy this again!

I’m an 100% AMSOIL user I would not use anything but from my lawnmower to all vehicles and farm equipment

We have swapped to AMSOIL AMSOIL Signature Series 15W-40 100% Synthetic Max-Duty Diesel Oil which appears to be the best product on the market. The purchasing process and speed of delivery make AMSOIL a must buy product we will trust AMSOIL products in all of our equipment and vehicles.

I think this honestly may be the best oil ever for Cummins OTR trucks.

Good oil

Only have approximately 4K miles on the oil. Appears to still be consistent. Added a bypass system at same time. Waiting to reach 15K miles and send in sample for testing. Will follow up

Bought this for my tractor after reading reviews and comparisons. My equipment is expensive, so I want the best in it. I'm told this is it. So far , so good.

I use the 15-40 signature series in my RV with a 12.8 liter Mercedes Diesel. I noticed a difference on my way home from having the first oil change with the Amsoil. On our first trip my wife ask what I had changed. She said "the engine is quieter and smoother". Now it's the only oil I'll use. Thank you for a great product.

Oil should work great but was disappointed they did not have my oil filter in stock. I really want to shop for everything at one spot.

I reduce the consomption of oil of my truck in half !

Since using this oil the engine sounds and runs smoother and stays cleaner longer and I get better fuel economy. I trust no other brand. I use amsoil in anything that takes oil.

Used it in two different trucks. And so far impressed with how smooth it sounds running. It seems to be quieter. I have 3k miles on one truck and 500 miles on another. Both trucks are ford 6.0’s. And so far I'm impressed.

Been running Ams oil in my 21 f150 3.0 diesel for over 30kmi! I’ve noticed smoother cold starts in subzero temperatures and increased fuel economy! Oil is always shipped very quick right to my door and is well packaged, they provide a nice receipt with date and time stamp which helps with keeping track of my multiple vehicles. Also they usually put a hat , flashlight, tool or sticker in the order free which is nice!

Best oil on the market.

I've been using Amsoil since I bought my truck in 06, pull a 27' camper and have not had any engine issues. Change oil every year whether it needed it or not. Excellent diesel oil

Only thing I use

I have a 2016 ram 1500 eco diesel. The engine is a little quieter. Maybe a slight increase on fuel. I like it and will definitely keep using it. Shipping time was decent.