[Chasnracin]

I pick up my DEF from the Ford dealer. I might pay a dollar or so more for a jug, but if something is wrong with it, it came from them. I try not to let it get much below 1/2. When the "Less than 1/2" pops up on the screen, I throw in another jug. I have let it get to the "I'm gonna derate you soon" screen and once filled, it took several days for the system to reset. I didn't care for that.