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i know on autos if your over 100k dont change the fluid. but what about an M5OD? it has a new clutch (which shouldnt matter just throwing it in) and a small leak from the tailshaft housing. i am thinking about just draining it all putting in lucas and dex/mercIII and runnin with it. good idea or horrible idea? my truck has 225k on it. as far as i know its never been done b4.