Rab

Any thoughts on the source of an oil leak from my late 90 760GLE estate. It has been bad for a while now but is getting to the point of having to be fixed. It seems to be coming from the front right of the engine (passenger side) and from just below the rocker cover. I checked the old Haynes manual and the only thing that I can think of in that area is the oil seal where the distributor rotor connects to the camshaft (this is the later engine with the distributor at the front of the camshaft rather than at the back next the bulkhead. Anyone had similar problems and if so is it easily rectified, the manual makes it look easy.
Also I used to have an 240GLT estate and the breather valve used to get clogged - does the B280E have a valve and if so where is it?

Thanks

Robin