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Rear differential bolt snapped, diff nearly fell out, and had entire differential replaced under warranty (mods are light/bolt on and no aggressive launching/overrevs)..this is for a 2011.5 E90M3. Did quite a bit of research into this, and while arguably not a "common" problem, there were several complaints of the exact same issue (count at least 15 from historical message boards). Also had both front EDC struts replaced (think that was due to construction around my building, which made the road extremely rough), also covered under warranty.
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