Because of Covid my F-350 6.7 diesel has been garage kept since February. The DEF tank is full. DEF has a shelf life. Should I be concerned enough to consider draining the old DEF? My first diesel. T...
I'm amazed how this Cummins drains that Def tank when towing and especially in mountainous conditions. I know the covid thing is real but we are staying the course. About 13k miles annually towing a 28 ATC. DEF is never in too long! Currently heading to locked down palm springs. Lucky our reservation was held!!