Have you forgotten that it's a Volkswagen There was a sticker available " Original Oil Dripper" say no more

They mark their spot when parked as Hudge says. All you have is a oil throw dished washer and the scroll on the pulley there is no actual seal just a small gap.

 
Don't mind the oil, just keep cleaning the exhaust 

No problem with engine breathing here.....taken at a mates workshop this morning.
https://www.youtube.com/watch?v=fHKIA6Rd7JU

Remade my oil lines to the remote filter. Seems tomhave cured the problem, at the moment 
Paul

you say its leaking out the crankcase pulley ? .   There should be a throw washer behind the front pulley to stop oil from leaking out the front pulley.
take the pulley out and see if its there.

its item 3

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Yes Grissley, thenthrow washer is there. Checked and remade my remote filter hoses, this seems to have cured my issue at the moment. Can't be sure by the effect of an oil leak near the crankpulley may have masked the source of the leak. Spent weeks on this, nver been certain exactly where my leak was from!
Thanks for your suggestion.

Paul

Grissley, P.S. good to have you back.

are you aware that some pulleys are smaller dia where it fits in the case hole. 

I wasn't but thanks.

What angle is your filter at?
If it is vertical so there is no chance of air in there then my theory  is pants, but if it is sitting at an angle there could be an air bubble in it, this would compress when there is oil pressure and when you switch off then it would continue to push oil forwards or back until the pressure is released putting slight pressure on the case with the thrower thread not spinning.
Might be a daft idea but that is the best I have for why playing with the oil lines could make any difference

Pants.....

VW put them on sideways on the last Mexi bugs.

How about all the air in the crankcase.......?