Video: Understanding the New CK-4 Diesel Oil Specification
The new CK-4 diesel oil specification prompted Ford Motor Co. to issue a technical service bulletin warning Ford owners not to use it in their 6.7-liter diesel engines. The CK-4 diesel specification removed the valvetrain wear test (ASTM-IIIG) used on all previous diesel specifications, like the CJ-4 diesel oil spec. Ford 6.7-liter owners should continue to
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