WARNING: This page is about a different car, the 2007 BMW 550i and 2006 BMW 550i. However, it is still accessible from the selected car via links, so may be relevant.
TECHNICAL DATA - WHEEL BEARINGS AND STEERING KNUCKLE ALL (31 21)
Bearing units lubricated for entire service life and cannot be disassembled
max. axial runout of wheel hub at wheel bearing flange