DEF Shelf Life!
Just a quick tip for those that are new to Diesels with all of the newer emission controls. DEF apparently has a shelf life and using anything other than DEF bought from the dealer may void your warr...
Forum Discussion
I have a 2011 GMC and the only DEF related problem i have had was when it was a week old. It has never had DEF from the dlr other than the first tank. Heat and sunlight are its enemy. Its so common place now that i am not sure you could even buy any that has been sitting long enough to go bad.
