Originally Posted by BillyE
Originally Posted by 2015_PSD
Originally Posted by BillyE
Originally Posted by wdn
The owners manual says 10W30 CK-4 or if using biodiesel blend, which nearly every gas station is now selling B5 diesel, you may use use 15W40 CK-4. By the way the owners manual does not say you must follow the Ford spec it just lists weight and CK-4. I doubt Ford's list is enforceable, because the owner's manual says CK-4.
This is very interesting to me. My 2017 Job 1 truck lists CJ-4 and I assumed that the newer owners manuals listed the new spec. Very strange that the newer ones list CK-4 when Ford clearly has said that CK-4 is not a sufficient spec for the 6.7. What year is your truck?
There are plenty of CK-4 oils on Ford's approved list for the 6.7L:
Ford Approved CK-4 Oils
Yes, I know that. In fact, to meet the spec they must also meet CK-4. But CK-4 alone is insufficient, at least according to Ford.
That horse has left the gate...a looong time ago. Ford with its seemingly infinite inability to adopt a standard created its own standard about a month before CK-4 deputed. Very little CJ-4 on the shelves these days (I just offloaded about 40 gallons of it). so if one cannot find one of the oils on the list, on is stuck using CK-4 without the -F1 Ford approval--another one of Ford's better ideas...