WARNING: This page is about a different car, the 2010 BMW M5, 2009 BMW M5, 2008 BMW M5, 2007 BMW M5, and 2006 BMW M5. However, it is still accessible from the selected car via links, so may be relevant.
TECHNICAL DATA - WHEEL BEARINGS AND STEERING KNUCKLE ALL
Bearing units lubricated for entire service life and cannot be disassembled
max. axial runout of wheel hub at wheel bearing flange