oil grades
My new 2016 Ford Power Stroke F 250 diesel recommends oil 5w-40 syn. oil for towing. I’ve been using 15w-40 Shell Rotella. What oil have you been using?
Forum Discussion
5W-40 syn is the Ford approved heavy duty oil. Heavy duty has a bunch of triggers including towing more than 1000 miles (but they don't say if that is per oil change) or idling more than 10 minutes per hour (which isn't much if you do any city driving). I do both so it is 5W-40 for me in our 2012 6.7. 15W-40 is only good down to 20 degrees F which is not a problem in the south but the full synthetic oil will give better protection in very high temperatures of the south.
