Ford 6.7 - what oil do you use?
I know the question will elicit various responses, but a post regarding a 2012 Ford 6.7 engine failure on another forum prompted the question. He used 10w30 non-synthetic oil which he stated was chan...
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Been running Mobile 1 Delvac for years. Ran it in a 4wheel Case tractor with 855 Cummings. Couldn't believe the hours we put on it. Still not using oil when traded off. Probably ran 500 hours before changing. I did oil samples to determine drain period. Today in the 6.7 I still run Mobile Delvac 1, which is heavier then Mobile 1 for Diesels. I run the 5W 40, as Ford says.
