I can't think of any way that a leaking valve cover gasket would cause this sound. Sure it's time to replace the gasket, but I wouldn't expect it to fix the rattle. It would however give you a chance to take a look at the timing chain.
Do you by any chance have any CEL codes? __________________ *Except 318ti 
'97 318ti M-Sport
'95 M3
BMWCCA |