Even though it doesn't get very hot here, I usually wait until the tank is almost empty (I think the first EVIC warnings appear when you have around 500 miles before it won't start) and then add one 2.5 gal. bottle so it's usually no more than 1/4 full. I will add more before long road trips.
Originally Posted by JGCDieselPowered
How long did it take until the computer told you to refill the DEF? Not that I care to refill it if I don't have to, but I have 8000 miles and 6 months on the same factory DEF. After the hot summers of Phoenix I would expect the DEF to be "expiring" by now. The gauge is still showing over 1/2 full. Has been at 1/2 for about 2 months now.