Seals And Gaskets

Replace the O-rings, seals and gaskets.
After removing gaskets and seals, always inspect the contact surfaces on the housing/shaft for burrs or damage resulting from removal.
Before installing the seals, lightly oil the outer circumference and fill the space between the sealing lips -arrow- halfway with Grease:G 052 128 A1 .

Fig 1: Identifying Oil Seal
Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.
The open side of the seals point toward the fluid to be sealed in.
Only use DSG transmission fluid. Other lubricants cause malfunctions.
Check the oil level in the all wheel drive clutch after replacing gaskets, O-rings and seals.