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CK-4 Synshield

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

You can choose from synthetic plus or full synthetic heavy-duty diesel engine oils. They all 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. Using Schaeffer’s proprietary friction modifiers, Micron Moly® and Penetro®, all SynShield® engine oils 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. 
Schaeffer’s SynShield® 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, and the results consistently show their 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.