It would be easier to provide a list of places that thing DOESN'T leak from
I've got one on the inlet side of the engine which has me stumped - it runs down the side of the sump and the starter motor is covered too.
The highest point I can see it is the oil pressure switch (which is on a tee-piece due to the defi sensor).
I don't THINK it's the head gasket (whilst it is dirty, the block isn't particularly oily)
The threads on the pressure switch are clean, so unless it's leaking from the body, it aint that.
It could be the sump I guess, but I took that off and resealed it in 2003 (Sure hope it isn't the sump as it was a NIGHTMARE to do in-situ

)
Does anybody else have any suggestions?
Neil.