DEF Blue Adding

jalichty wrote:
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?

Since you show WY as your location, I agree with others. Down here with the south TX heat I only add what I think I'll use in the next two or three months, especially in the summer. Over time, heat degrades DEF and that's one more problem I don't need.