Originally Posted by oldskewel (Post 1183575)

My understanding is that there are 10 codes that will work with the EWS system in your car. You get 3 (?) of them in the keys that come with the car. The remaining 7 codes are just information securely stored back at the mothership. No keys or chips are pre-made. No communication is needed with your car each time a new key is issued.

Originally Posted by Clavurion (Post 1183576)

4 keys from new: 2 remote, 1 valet, 1 wallet key. So 6 key codes remain for spares.

Here some additional bedtime reading about EWS.

http://www.e38.org/EWS.pdf