Does your noise sound like mine? Start at the 25 second mark, sound is most audible around 27 seconds. It's like gear meshing or timing chain rubbing on the guide noise that comes and goes (not in rhythm) but is always there. I have had an indy BMW specialist and a BMW dealer both listen to it and they have nothing to say. I worry because I've never heard another S65 sound like mine.
I have put a stethoscope all around the engine and the sound is most notable when putting the probe on the cross-hatch patterned area on the front of the driver-side cylinder head.
My next step is to have
deansbimmer take a listen when I have it in for rod bearings at some point.