DEF Shelf Life!

It comes down the service department. I have had excellent service from Ford at my local dealer, but there are dealers in my area I would avoid (even if I had to pay a tow charge). I feel the same can be said for Ram and GM dealers although ultimately it is a reflection on the manufacturer. I would like see manufacturers weed out some of the bad dealers, but I can see how economics of cutting off a high volume dealer conflict...

I am also learning about DEF and considering whether my next truck will be diesel or gasoline powered since these emission systems are so much more complicated and expensive.