I'm thinking about a factory NAV for my '08 3LT. Is it possible to play a DVD with MP3 files in the DVD player? The manual isn't very specific. Thanks.

 

No, the non-NAV disc drive is a CD-ROM only. However, it read my CD-RWs w/ mp3s fine.

Here's page 3-94 from my '09 manual:

Using an MP3

MP3 Format

Radios with the MP3 feature can only play CD-R discs.
Do not mix standard audio and MP3 files on the
same disc.

Supported File Structure

Radios with the MP3 feature support up to:
• 50 folders.
• 11 folders in depth.
• 50 playlists.
• 255 files.
• 10 sessions.

Root Directory:
The root directory is treated as a folder. Files are stored
in the root directory when the disc or storage device
does not contain folders. Files accessed from the root
directory display as F1 ROOT.

Empty Folder:
Folders that do not contain files are skipped, and the
player advances to the next folder that contains files.

Supported Bit Rates
The following bit rates are supported: 32 kbps, 40 kbps,
56 kbps, 64 kbps, 80 kbps, 96 kbps, 112 kbps,
128 kbps, 160 kbps, 192 kbps, 224 kbps, 256 kbps,
and 320 kbps or a variable bit rate.

File Naming
ID3v1 and ID3v2 tags are supported. The track name
contained in the ID3 tag is shown on the display.
The display only shows up to 32 characters for track
and file names.

If the track name is not contained in the ID3 tag, the
display shows the file name without the file extension.

Playlists

Playlists that do not have a .mp3 or .wpl extension may
not work.
Preprogrammed playlists created by WinAmp™,
MusicMatch™, or Real Jukebox™ software are
supported and they cannot be edited using the radio.