O-Rings, Gaskets, Seals

WARNING: This page is about a different car, the 2016 Volkswagen Beetle, 2015 Volkswagen Beetle, 2014 Volkswagen Beetle, 2013 Volkswagen Beetle, and 2012 Volkswagen Beetle. However, it is still accessible from the selected car via links, so may be relevant.

O-rings, gaskets and seals must be replaced.
After removing seal rings and seals, always inspect the contact surfaces at housing or shaft for burrs resulting from removal, or for other signs of damage.
Before installing the seal rings, 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 Sealing Lips
Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.
The open side of the seals point toward the fluid to be sealed in.
Coat O-rings with ATF before inserting to prevent crushing rings during installation.
Never use any other lubricants in the same areas as the ATF. Otherwise there is a danger of malfunction of the transmission hydraulics.
Check the ATF level. Refer to ATF LEVEL, CHECKING .