Finally got around to taking the e90 to my buddy at BMW. Here's what he said:
Quote:
Before i deem your driveshaft or rear diff as failing. this would be the first thing to do. The lubricant acts as a damper for shaft movement. again this MAYBE the issue.
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Here's a link to the SB:
https://docs.google.com/document/d/1...it?usp=sharing