Been reading these posts as i picked up a 07 328xi a few months back. I notice a metal rattle of sorts only on start up usually on cold days, it lasts for maybe 2-3 seconds and goes away. I have no noticeable valve train noise or ticking during running, so im wondering if my symptoms are similar to others?
Also it seems as if going to the dealer is a hit or miss to rectify this problem? I still have a valid aftermarket warranty, so im wondering if its worth pursuing..