Not saying a bad batch of packaged DEF is impossible, but the stuff is made in large batches, so, tampering and date code aside, there would be a ton of people with issues from that batch. Like when we were in the paint business, Benjamin Moore's Newark plant had a batch capacity of 10,000 gallons. Someone who had not followed instructions, and/or completely skipped the cleaning and prep stage would come in saying, "I got a bad gallon of paint!". Well, what about the rest of that pallet we sold, and the multiple trailer loads Moores sold out of the same batch with ZERO issues??? GMAB