Oil choice for the 6.4
First oil change coming up on the recently purchased 6.4. I have always used Rotella T 15w40 in my 6.0 and was curious as to what seems to be working out the best in the 6.4. I will stick with the Motorcraft filters, but I want to lean another direction on the engine oil. I have been reading alot about the Mobil 1 Delvac 1300 15w40 and it does specify on a few places that i have seen, that it meets all International/Navistar requirements. It does not say Ford though. It is also endorsed by Cummins. I am aware the oil has to meet API CJ-4 requirements for emissions but I would like to hear from everyone about what oil they have heard being used the most? Appreciate it.....
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