[///M Power-Belgium]

I know you know the cold start clunk noise too , because I saw your comments in that thread and lots of S65's have it and such as my car too .
The only time that I saw that the clunk noise was 100% fixed was by replacing the vanos-gears .

But now about the noise in your video...
I never heard a rattle noise that loud and that long on a S65 !
And it is for me personal absolutely "NOT" normal !!!
Personal I would show that video at your BMW/Dealer ASAP .
Please keep us posted about that rattle noise..