Schaeffer Manufacturing Co. 0700CK4-012 SynShield Durability Advantage 15W-40 Diesel Engine Oil, 12-Quart Bottle (Pack of 12)

Great oil, can go way longer now on oil changes. Saves money on maintance. And motor runs so smooth.

Great oil truck starts better when cold

Fantastic oil but one of the quarts leaked a couple ounces during transit.

Used it for years in my gm crate works great

After 2 hours run time its still clean.

Use exclusively in my 2017 Ford 6.7 powerstroke. Great oil.

I use this oil in a 2007 F-350 SRW 6.0 bulletproofed powerstroke and also a 2020 Ford F-450 6.7. It meets the Ford spec and its one of the best oils in a Ford diesel. I have analysis and used delvac, rotella, delo and Amsoil. Best mpg, best wear protection. In 8k miles in a 6.0, total of 9ppm for iron and 3 for copper.

For Hubbys stuff..

On time great product thanks

best unknown secret oil out there, oldest oil company in the USA.