It is over-reading by design.

German law requires speedo accuracy to be within a certain range, essentially up to a few percent over, but not under at all. Because of production tolerances, and the penalties for under-reading, all of them are designed to read high. It is usually more than 4 km per hour at 100.

It is only the speedometer, the odometer is accurate.

__________________
2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue