I filled the AdBlue on a Friday with the low warning at something like 200 or 300 miles until no-start. It took 5 gallons and wasn't completely full. The low warning went away. On Sunday evening, I got a check engine light. Monday afternoon, the AdBlue Error came on. The codes retrieved by the dealer were for Reductant Quality and Reductant Consumption Low. The dealer tested the reductanct and it passed quality. I assume the check engine was for one of those codes.
The service advisor told me this happens often with these when the tank runs low. It seems to me that if that is an issue, it should give a warning much sooner than 600 miles. I'd really like to have a warning at something like 1500 miles. When I often drive 500 miles in a week, that doesn't leave much time to get the tank filled once the low warning comes on. If it happens again, I'm getting a tune and delete. I'm not sure how much having a Ross cable would help since I don't have a clue how to "re-adapt" the system.
Yes, I realize that $130 is not a lot of $. With the rental it is actually $172. It was more about the principle of things. The warranty should have covered it. Saying it was due to lack of maintenance was just a weasel move by the dealer.