DEF Blue Adding
Just wondered whether a person might "top off" the DEF tank instead of waiting for the warning stuff to light up and mess with my comfort level? Does it hurt anything to do this?
Forum Discussion
Remember it can get really old if you don't use on a regular basis. Mine may set for a few weeks in the winter. I understand in extreme weather (hot )r cold) it can go bad. I don't worry about it but will not store it up for a year or two. I have some in the ahead that I'm now afraid to use.
