Hi Jehu,
I have the exact same problem. There is no leak when its off/cold. When it is running mostly the oil falls on the motor mount. I heard these motors have problem in the upper timing cover gasket. When the oil leaks from upper timing cover gasket it is blown by the fan arround and some of them appear to be leaking from the head gasket. I am going to try fixing the upper timing cover gasket first.
Thanks
Arun
530i / Nikasil M60 3 Ltr Motor / ZF5HP18 (A5S 310Z) Tranny / Prod: March 95 / Fully stock / 95K miles