how's the crank seal looking? for the sake of an extra hours work, I'd recomemnd removing the crank pully(replace if necessary as mine was well worn) then remove the oil pump housing cover, change the crank seal in that and rebuild it with a new gasket too. whilst you've got the cover off, check the oil pump chain drive tension, as they can get a bit rattley when worn. If it does need adjusting the allen head bolts can be a little soft, so some replacements wouldn't go a miss, the one's I was given from VW/Audi dealer were normal hex heads which gave me a bit more confidence on the rebuild(careful you don't drop them in the sump when renoving them).