DEF how old is too old?

VinnyP wrote:
Any ideas? Or should I just breakdown, dump it and buy a fresh jug?

Pheww, quite the quandry here. You have an expensive truck that presumably is worth alot of money becasue it's fairly new, diesel, and likely doesn't get driven much.
Now you have a partial jug that you didn't manage to use in the last year or so and how long will that DEF sit in your truck?

Bottom line don't be a cheap ___ and save yourself potential/likely future headaches at the expense of spending 10 whole dollars on your truck.