The BMW spec is 2.4 mph + 10% as a maximum error IIRC. Regulations require that there be no under-reading, and there is a natural range of accuracy due to manufacturing tolerances, tire tolerances, etc, so most BMW speedometers will typically be 2.4 mph + 5% high. The high reading is intentional, due to the high penalties for reading low.
The odometer is not subject to the same regulations, and is therefore designed to be accurate.
The speedometer is not adjustable.
Good thread here, with a link to the BMW TSB.
http://www.xoutpost.com/bmw-sav-foru...naccuracy.html
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
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