Oil Leak

[Bohsfc]

I've never even heard of a gearbox breather leaking - in fact I'm struggling to think how it could (unless the gearbox is massively overfilled with oil).

Can't be overfilled.

 

[MattW]

Can't be overfilled.

I know (Unless you laid the bike down on its side )

That said, I do know someone who managed to get an extra half litre into an car gearbox by squeezing very hard and putting the plug in quickly. He shouldn't really have been allowed access to spanners...