old guy wrote:
a neighbor came by today while I was out in the front yard and we got to talking about his truck. I asked if he had a (I believe this is right) a DEH tank on his truck, he said no it was only a 2004 but he was told by another guy who did not like to spend the money on the oil to put in it and the guy just filled the tank with water. said no harm to the truck so far. is this a smart thing to do? seems like the truck will have problems eventually besides being illegal.
I say BS. if he did have a DEF tank, filling with water and very quickly the truck will be giving warnings, and shortly thereafter speed limited, starting at 55mph and eventually 5mph till he gets it drained out and filled with DEF fluid.
5 gallons of DEF lasts me about 6,000 miles, and the cost is about $10-15.