Hi Petterf,
Okay from the knowledge I have picked up it is as follows: -
The old ML unit is: -
- 11 upgraded speakers
- ML AMP
- ML head unit (with 6 CD changer)
- No DVD playback function on the header unit
The newer ML unit is: -
- Same as above
- But with DVD playback function on the header unit
I believe the difference was made around the time that they upgraded the resolution of the sat nav screen, but not sure when this was. Sometime in 2006 I think.
Also there is a left and right hand drive variant of the header unit with the volume/power and tune nobs swapped from left to right side accordingly.
Hope this helps