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Have the F-250 6.7 L diesel, new, only 1500 miles on it. Got to reading the Diesel Supplement Owner's Guide.. and notice that 5W-40 is recommended for "severe service operation" ... including such things as (two things will be doing when using this to pull my 5th wheel) "towing a trailer over 1000 miles" and "sustained high-speed driving at GVWR", to list a couple. So, am thinking I should run the 5W-40 (also, previous diesel engines I have worked with... often used at least the 15W-40).

But, called the dealer, service department... explained my use... and, he said it is shipped with the 10W-30, and he recommended staying with it.

What think? My sense is to change it to the 5W-40...
 
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