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I agree open it up and see what happened. Doesn't seem like a common problem surely, we'd be hearing about it if were prevalent. Can I ask if you have followed the BMW recommended OCI's ie: 19,000-20,000 miles between oil changes
Also if you've spun a bearing there's going to be swarf through the oil cooler and lines so make sure you get a new setup or you'll likely spin another bearing on the new engine.
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