I'll put it this way:

I know two people who own/have owned transmission rebuilding shops. They both tell me that the flush machines are the best thing that ever happened to the transmission rebuilding business; Many customers come in with transmission problems when their cars worked fine before a recent flush. The story usually includes the customer going back to the flush/change shop and being told that the trans was likely about to fail, and the clean fluid was just too much for the transmission (or some version of the same excuse). Neither of these guys will use a fllush machine nor allow one near their vehicles.

I believe that it can be done properly, but if not flushed properly then catastrophe will result.

Also, the flush does not address the filter. If you have the pan dropped to change the filter, you can assess the type and amount of sediment in the pan for some diagnostics, plus then half of the fluid is already drained. Mercedes equipped the torque converter with a plug also so that you can drain almost all of the fluid in the system (even a fair amount from the cooler should drain back), so there's no reason in my mind that one should short-cut the change by using a flush machine.

Further, many of the shifting problems in these 722 transmissions seem to be a result of a plugged filter, ...

At this point, seems kind of silly clicking the "Post Quick Reply" button.

__________________

Gone to the dark side

- Jeff