I have this strange noise that sounds like hitting a tin can with a spoon at random times noticeable at idle. in the video from around 3sec to 12 sec you can hear it. notice im not talking about the consistent injector noise but the high pitch tick at random intervals. Could this be the chain? should I be concerned? Please help with any ideas what to check before risking some kind of engine failure.
I have over 100k miles on the car but it was under waranty and bmw serviced up until now under extended dealer warranty. The previous owner even bought his tires from the dealer for god sake.