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...
Forum Discussion
rhagfo wrote:
99% of diesels state to run 15/40 why would one use 10-30?? Did it mention what brand??
Because the owners manual and the oil cap both say 10w-30.
That said, my stupid dealer put in more than 2 quarts too much of 15w-40 oil in the dead of winter during my first "free" oil change. I even showed him the oil cap before and after the change! Had him drain some out and then when I got home I drained 15.25 quarts out of my 13 quart engine. Never again.
I now do it myself using Rotella T6. Ford says to use 5-40 or 15-40 if using bio-diesel. Since it is getting hard to avoid the bio, I think that it would be best to use full synthetic 5w-40 at all times.
