Special Application Services

• Severe Commercial Use Vehicles Only: Lubricate chassis components every 5 000 km/3,000 mi.
• Have underbody flushing service performed once a year.

    See also:

    Bulb Replacement
    For the proper type of replacement bulbs, see Replacement Bulbs on page 10‑29. For any bulb-changing procedure not listed in this section, contact your dealer. ...

    Customer Assistance for Text Telephone (TTY) Users (U.S. and Canada)
    To assist customers who are deaf, hard of hearing, or speech impaired and who use Text Telephones (TTYs), GMC has TTY equipment available at its Customer Assistance Center. Any TTY user can communicat ...

    CD-R- or CD-RW- Supported File and Folder Structure
    The radio supports: • Up to 50 folders. • Up to 8 folders in depth. • Up to 50 playlists. • Up to 255 files. • Playlists with an .m3u or .wpl extension. • Files with an .mp3, .wma, o ...