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WSS-M2C171-F1 vs API CK-4
Posted to HD/Fleet Forum on 6/14/2018 4 Replies

Let's separate the fact from fiction:

The relatively new API CK-4 diesel oil approval has been controversial. Ford experienced excessive engine wear when SOME CK-4 products were used in fired engine wear tests. The increased wear was on rocker arm fulcrums, ... Login to read more.

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