this is a possible fix that worked for me when i was attending to something else.

i'd changed the air filter and while i was there cleaned the box & hose through to the intake manifold which was found to be rammed with carbon residue,
cleaned this out swiftly with the aid of a screwdriver and some carb cleaner paying attention to the inlet hole for the pipe from the oil seperator which was virtually blocked.



although the cleanout didn't do much for performance it stopped the oil seep