Audi R8 2008 Service Training Manual page 22

Engine
Service
There are four screws which must be removed in order to
drain the oil from the engine; three from the oil pan, one
from the oil tank.
8
Caution: Do not loosen or remove these
screws, as this is the pressure oil connection
of the oil pump.
Oil Pan Screws
Oil Tank Screw
Do not loosen the two screws specified in the illustration
below.