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  1. M5 is howling a bit at speed

    M5 E39 and E60 tips & tricks
    I've been researching this issue like crazy for the past two weeks and I can't put my finger on it. I've got this weird groaning/howling noise that comes up on the M5 around 40mph and up and it seems to sound the loudest around 55mph. I replaced the differential and transmission fluid yesterday...
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