O-Rings, Gaskets And Seals

Always replace the O-rings, gaskets and seals.
Fill the space between the sealing lips halfway with sealing grease for seal G 052 128 A1 before installing the seal.

Fig 1: Identifying Oil Seals Sealing Lips
Courtesy of AUDI OF AMERICA, LLC
The open side of the seal faces the oil.
Check the Automatic Transmission Fluid (ATF) level after installing.

CAUTION:

Be cautious when dealing with ATF. Dispose of drained ATF properly. Bear in mind that: One drop of transmission fluid can contaminate 1000 liters (264.2 gallons) of drinking water.