I've always questioned the Power flush systems for auto trans, thought immediately about the filter but I was in a hurry and needed it done last year and had no time to do it myself so I let them do it. Never, never again. It would be like getting a power flush in your engine and not change the oil filter, just doesn't make sense. Now it is even more evident for me. Thought I was in for an expensive weekend when I was thinking the trans went bye bye. It actually ruined my Sunday since I was all bummed about having to put out a big chunk of cash on a new trans.