My 2005 3.0d with 200,000km doesn't do that. In fact, having just changed the oil (Castrol Edge 5W-30) it's so smooth and quiet at all RPM I can't quiet believe it. I changed the engine breather/oil seperator too, about a week before the oil change, so that may have something to do with it too.

There's a few items that could rattle - the actuator rod on the turbo variable gate is one that comes to mind but I'm not sure it would be a clattery as a cam chain hitting the cover. The v-belt tensioners can make a racket when badly worn too.

And then there's the vacuum pump on the front of the exhaust cam.

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Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)