I haven't done this to a MB tranny pan but it is possible to reuse the pan. The usual distortion caused by overtightening is a 'dimpling' or depression of the metal around the hole. By turning the pan over and carefully hammering the 'dimple' flat, the pan can be reused.
This leak trouble makes me think that I'll just do a flush through the transmission oil cooler lines as I do with my Volvo. This changes all the oil but not the filter. It is very easy to do, you need not even change clothes!
Has anyone been changing their tranny oil by this method? What was your experience?
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1986 300E
1993 Volvo 940 Wagon
1984 Volvo 240 (daughter's)
1976 Dodge 1/2T pickup, gas hog