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Mine does that too. Replacing the tensioner/pulleys doesnt make it go away. Replacing the Vanos solenoids helped, but it doesnt completely go away. Unclear if that is coincidence or not.
Same scenario though.... only does it on a cold idle then it goes away. A touch of the throttle also makes it stop. If you shake a vanos solenoid the valve inside it does move back and forth.... so it makes a bit of sense here. Cold oil is thick, it may not flow through the solenoid valve as well as warm oil, which is why warm oil or increased pressure makes the noise stop.
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