Oil Distribution

WARNING: This page is about a different car, the 2022 Audi SQ7 and 2022 Audi Q7. However, it is still accessible from the selected car via links, so may be relevant.

Transmission with Combined Oil System:

Fig 1: Protective Pipe, Transfer Case And Front Final Drive

Courtesy of AUDI OF AMERICA, LLC

The oil chambers inside the front final drive -3- and inside the transfer case -1- are consolidated via the protective pipe -2-.
The side shaft runs in gear oil in the protective pipe.
No oil overflow hole present.

Transmission with Separated Oil System:

Courtesy of AUDI OF AMERICA, LLC

The protective pipe -2- is free of oil, the transfer case -1- and the front final drive -3- is sealed with a gasket to side shaft.
A transmission with separate oil system can be identified by the oil overflow hole -arrow-.