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