2005 X3 here. Stock CD players plays burned .mp3 files (burned as data --
not music files). So I can hold the equivalent of 6 or 7 CDs on just one
CD. It reads each folder with .mp3s inside it -- so you can put one album
(or one artist in a folder).
You can skip between folders by pressing the "m" button -- or without the m
button, it will skip tracks within a folder.
You can also just put all songs on the root -- and have like 100 songs at
This started with the 2005 X3 models (2004 can't do it).
MP3 playback is, I believe, an '05 and later feature, and then only
on the in-dash CD player (MP3 is supposedly not available with Nav or
the CD changer). Of course, you can always go aftermarket, or via the
optional aux input.
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