Excellent quality , Great price for synthetic oil. Use it in the 2019 ram Cummins.

Great stuff..

Tractor is running better and starts easier since oil and filter swap to Amsoil.

Heavy equipment requires an oil that can go beyond this required demand. This oil is extremely superior to any on the market that is available.

I have always used Royal Purple 15-40 in my diesel engines but decided to try Amsoil 10W-30 after watching a head to head comparison online. After the oil change to Amsoil and Amsoil filter my F-350 Superduty seemed to quiet down a bit. This might sound crazy but she seemed to say thank you by running smoother and quieter. I highly recommend Amsoil oil and filter.

I use this oil in 6.7 and 6.0 Ford engines. As well in John Deere tractors. Oil works flawlessly. Will continue to use

My diesel truck had a plugged EGR code and was getting sluggish to the point my turbo would only spool up to 15psi at WOT. I cleared the code with a scanner and decided to switch to Amsoil. After 4,000 K my EGR seems to be clear, my turbo spools to 22psi now at WOT and the engine feels better. The last time I used Amsoil was back in the 90's, no lie. The quality is still the same if not better! I'll be sticking with Amsoil from now on.

My 1990 f350 7.3 sure loves this amsoil 10 30w hd oil. Everything i own runs on amsoil and i get better results including mpg and quieter motors

I purchased my 40 horse LS tractor last year. After the 50 hour break-in, I changed the oil to Amsoil. The 3 cylinder diesel engine runs smoother on Amsoil and I won't need to use a heater in the winter because of the cold weather flow of Amsoil.

7500-10k between changes and the truck idles at night; sometime doesn't shut off for days. I get the filter also. 6.0 powerstroke