Good afternoon,
so i've been getting engine oil into the gearbox bell housing causing clutch slip

i changed the end crank seal for a genuine seal from vw and a few weeks down the line i noticed oil and slipping again.
i fitted new end seal and gasket and new clutch and pressure plate.
the seal was a real tight fit so unsure where the problem lays.
has any one seen this before?
Regards
Gareth