After this message was posted, i bought my next DEF at the dealer. I was traveling in the 2500 for almost all of June. And when we returned from our trip i had to get some warranty work done on the leaky third brakelight. In early July after returning from our June trip, i bought 2.5 gallons of mopar DEF from the dealer. I was there anyway. It was almost twice as much as the PEAK DEF, but had a much easier to read mfg date (uncoded). It had only been on the shelf 2-3 months. And since the dealer had my mileage recorded on the same day i bought my DEF, i figured i would be covered from any DEF problems for several months. Paid a bit more for peace of mind. I filled up once at a Pilot pump (2 years ago). And talking to the semi rig drivers, most of them had rigs too old to use DEF. They were surprised to see my truck needed DEF. I have since decided against the crap shoot/uncertainty that i might be dealing with at the DEF pump. Because if few of those big rigs on the hwy use DEF, maybe it's not as fresh as PEAK? Or Mopar? Too many uncertainties. I don't know if the DEF tanks are underground or if they are in a building. I don't know if the lines that the DEF travels through could be compromised. I don't know if the DEF pump proximity to the diesel pump could render it contaminated.