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Hey Semja,
The RPM moving all over the place on cold start is normal. my car will start at 1100 and go down to 650 then back to 800 once its past its "cold start" phase. I could be wrong but its normal for RPM to move around on cold starts on N54.
Definitely looks like you are leaking oil from the valve cover gasket so i would get that fixed as soon as you can.
No bolt is missing. That spot is for the tow hook which is used when pulling the engine from the car.
Cheers,
Antonio
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