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Heavy-Duty Diesel

Schaeffer’s heavy-duty diesel engine oils give you premium advanced performance.


These heavy-duty diesel engine oilare formulated to provide maximum protection against:

  • wear
  • oxidation
  • sludge
  • soot contamination
  • and aeration.  

Schaeffer's engine oils will provide excellent equipment durability and longevity even during harsh and extreme duty operating conditions. Schaeffer’s own proprietary friction modifiers, Micron Moly® and Penetro® are added to these engine oils. They will create a slippery, tenacious shield that prevents metal-to-metal contact.

Schaeffer’s engine oils have strong viscosity control for stay-in-grade performance during the life of the oil.  Components stay cleanHigh mileage engines are prone to oil residue and soot buildup. Schaeffer’s uses enhanced detergency additives in their lubricants so that your equipment stays clean and free from carbon and soot residue. 

You can expect up to 5% fuel savings! Schaeffer’s engine oils are routinely tested each year at independent labs and the results consistently show real savings to your bottom line.

Her are some reviews from real customers:

"Fast shipping, good communication - and the best oil! Schaeffer’s is the best oil, I won’t put anything else in my powerstroke." Dan K.

"The only oil I use. Had a friend who was in the chemistry end of the oil business and recommended Schaeffer oil along with a couple of others. I went with the Schaeffer oil first off and I’m pleased with the results in my 2017 Ram 2500 diesel. Running 20,000 miles with a Donaldson filter with no oil added during that time. I’ll be going with the molly additive next oil change as well." Dale B.