How may times you did refilled 5gal DEF? Also did you got DEF warning light or dash MSG?Ive got 25,000miles and have filled the DEF twice. I filled it both times at a Flying J/Pilot truck stop.
I am expediting with my van, and do about 90% hwy.... 2015 3500 extended
Thinking about this a bit... now I'm planning to top off the DEF in the next week. Road trip to New Mexico coming up soon, don't want to deal with being on travels and refilling DEF. So while I'm curious when mine will signal, it'll be easier to just fill it now.I'm at 5200 miles, no sign yet for low DEF warning.