I would expect any good dealer to review the computer for fault codes, etc to see what was going on. I found your comments about topping up the def to be interesting. I carry def, but only add when it gives me the message that i have less than 1/2 tank of def. I never use def at the pumps anywhere. Good luck with your issue.
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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