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FA-4 Synshield

Schaeffer's SynShield™ Max MPG SAE 10W-30 is a premium FA-4 Diesel Engine Oil.

It is an advanced performance, synthetic plus, heavy-duty diesel engine oil specially formulated to provide maximum protection against

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

in 2017 and newer engines that specify an API FA-4 engine oil.

This is an API FA-4 engine oil which can only be used with 2017 and newer engines.  This oil is not backward compatible with CK-4, CJ-4 or any previous diesel oil.