For what its worth, I had a flush done on mine at the Isuzu dealership, tranny failed 3K miles later. Only took them 45 min to do the flush, and the truck was cold when they gave it back. That means they didn't follow the procedure, which says upon filling, it has to be running, and you shift through the gears and refill as you go along. Lesson learned, too bad the dealership closed up not long after Zu bailed on us.