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Ok so I am the 2nd owner of this car bought it at 38k miles and it’s at 59k miles. Been to 4 different bmw dealers so far. Not one has told me these cars are due for a rear diff flush around the 40’s. So at 57k miles I changed the rear diff fluid and the launch control works now. Does this make since? I couldn’t imagine the system being that touchy with fluid. It works every time now. Doesn’t make much since in my book.
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