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Not sure if Ford has changed the specification for oil in the 6.7 diesel. I use Mobil 1 5W-40 Turbo diesel Truck oil in my 2013 F-350 SC LB SRW and I tow 14,100 lbs. Trouble free for 85K miles. I am religious about changing oil & filter at 5K miles. That may be overkill but I see it as cheap insurance. I don't ever want to see the oil life reminder on my truck light up.
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