x2 on what shaun said about the regen. you will usually get a message on the dic sayin cleaning dpf don't turn engine off or something i can't remeber word for word. high periods of idiling will not only plug up the scr/dpf but will wind up clogging egr cooler. so if you have high amoumts of idiling make sure you have some highway driving to help clean it out. anyway thanks! i'm glad i found this place theres alot of good info on this forum.
Mike