Does Mercedes audio 20 play DVDs?

Only if you have a CD changer installed. (that is acording to the manual). I have Audio 20 with CD changer and I play CD's with mp3 files..

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I have a March 2008 C200 CDI with an Audio 20 single CD slot and I can confirm that it DOES PLAY MP3's. The LCD screen shows the compact disc symbol and MP3 logo alongside. Be aware that the it will play CDs with MP3 files as long as the CD format is CDFS (otherwise known as ISO9660 Joliet) (as written by Windows XP) but not UDF (as written by Vista). If you have Vista, use a third party CD writting program such as Nero or the free CDBurnerXP (http://cdburnerxp.se/ which does work on Vista despite the name). Make sure you set the format to ISO9660 Joliet. Hope this helps someone.