[PanJet]

It should Diesel. I use about 3 gallons a day. The avg. underground storage at a truck stop is around 7000 gallons. A lot of big rigs are on DEF now. So those tanks turnover pretty quick

I have no worries the DEF at truck stops is fairly fresh, but do they really store 7,000 gallons of it? I guess that's possible, but wow.

BTW, regardless of whether you buy DEF from a pump or from a jug at Wal Mart, I think this thread deserves a sticky. It is very useful information for all of us diesel owners.