Just got my first MB. An 09 C320 cdi with the Comand system. Manual says you are able to transfer mp3 music files from cd but when I go to the music register the copy files menu along with all others (except memory details) are greyed out. it says it has 6GB free so any ideas? The previous owner also purchased the C63 AMG 19" alloys from the dealer and had them retrofitted but I don't know the tyre pressures as they weren't an optional extra. Anyone know this as i'd hate to wear them out prematurely!