CK-4 Synshield

Schaeffer’s SynShield® diesel engine oils offer premium advanced performance. 

You can choose from synthetic plus or full synthetic. These heavy-duty diesel engine oils are formulated to provide maximum protection against:

• wear,
• oxidation,
• deposit formation,
• soot contamination,
• and aeration.  

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

Schaeffer’s SynShield® engine oils are designed to provide up to

• 85% less wear than previous CJ-4 oils and up to
• 77% less deposits and soot than previous CJ-4 oils. 

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

Schaeffer's SynShield™ #700 Durability Advantage, #711 OTR Plus and #722 Ultra Performance oils meet and exceed the Ford WSS-M2C171-E and WSS-M2C171-F1 and are approved by Ford. All Schaeffer’s SynShield® engine oils all meet and exceed API CK-4, CJ-4, CI-4, CI-4 Plus and older. 

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.