Can i
 

Oil-return pipes on my 930 81' are leaking. I wonder if pipes can be replaced without emptying oil from the engine? It has a dry-sump, so it shouldn't be that much oil in the pipes when engine is stopped, or am i wrong?

Thanx!

just drain the engine. no big deal. if it sits too long, it will refill and start drooling. the oil gravity feeds from the tank thru the oil pump gears.