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I've been using 15w-40 oil since new (2012 F 350). It's time now for a new oil change. I thought that I read somewhere here that the Ford recommendation for what weight had changed. I've searched but can't find anything recent.

Does anybody know?
 

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10W30, 15W40, 5W40, and 0W30 are all listed in the specifications for the 6.7L.
They require that they meet certain Ford specs (not all oils do.)
Here's the Diesel Supplement for 2013 Link
 

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I only use 5/40 it's the only full synthetic oil the rest is ether a blend or dino oil. I tow with mine and sometimes I have to put B20 in the truck. The book says if you use B20 you need full synthetic oil. Synthetic oil is more expensive but I only use synthetic in all my 5 fords and I have no oil leaks in any of them.
 
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