Oil Distribution

WARNING: This page is about a different car, the 2023 Audi SQ8, 2023 Audi RS Q8, and 2023 Audi Q8. 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

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

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-.