O-rings, oil seals, gaskets

WARNING: This page is about a different car, the 2008 Audi A4, 2007 Audi A4, 2006 Audi A4, and 2005 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Always install new O-rings, oil seals and gaskets.
After removing gaskets and seals, always inspect the contact surface on the housing or shaft for burrs resulting from removal or for other signs of damage.
Thoroughly clean housing joint surfaces before assembling.

Fig 1: Identifying Space Between Oil Seal Sealing Lips

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Before installing oil seals, lightly oil the outer circumference of the seal and fill the space between the sealing lips - arrow - about half full with grease G052128A1 .
The open side of the oil seals face the side with fluid filling.
When installing a new oil seal, position the seal in the housing so that sealing lip does not contact the shaft in the same place as the old seal (make use of insertion depth tolerances).
Lightly oil O-rings before installing to prevent them from being trapped and damaged when assembling.

After replacing seals and gaskets, check and, if necessary, top off oil level in transmission → Transmission oil level, checking .