This past week I was talking to a trucker , he shared a story about another driver that got in a bind . Apparently early this winter this guy hauled some equipment into the bush a fair distace from town . He was pretty much out of DEF and made the mistake of shutting his truck off at the end of his day . With the DEF tank empty he could not start his truck .The next day so he figured what the heck, tossed a couple of gallons of hot water into the DEF tank and got into town . Everything ran well and by the time he got into town he figured that he should add winter windshield washer fluid in the tank as it doesn't freeze and has been running with it with no issues this winter . Has anyone else heard of someone else doing this ? Any type of fluid in the DEF tank will raise the level sensor thus enabling the engine to run .