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I've never seen/heard anything like that before so I'm just going to throw some ideas out and see what sticks. If this is load related, but definitely with the engine, then that does help narrow things down. I don't think it can be anything with the belt drive or accessories. But it could be the timing chain or tensioning system. It could be the vanos system. Not likely to be valvetrain. Possibly a REALLY bad PCV failure?? Any oil consumption?
Again, I'm not sure, just seeing if anything gets the juices flowing and helps you figure it out.
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