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Re: WSS-M2C171-F1 vs API CK-4
Posted to HD/Fleet Forum on 6/14/2018 1 Reply

Hi Kevin

What's interesting, on the oil caps of these things, 10w30 is for "regular use"

"Severe" use calls for 5w40 synthetic, which our shop gets right from Ford.

The trucks we see, "severe" use is an understatement. Excessive idling, and running at fu... Login to read more.

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