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Looks like a few of us have had the same or similar problem. I also get a metallic engine noise from my car especially during cold starts and it is more noticeable when the engine idles after warm-up. I've taken the car in for this reason multiple times and have had the valves adjusted, later they were replaced, then finally the dealership decided to replace the entire cylinder head. The noise is still present and it comes and goes. I took in the car once again last week for the same reason, but they were not able to duplicate the noise. BMW needs to find a fix for this continuing problem!
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