See also:

Information on differential anddifferential locks
When the vehicle drives around a corner, the wheels on the outside of the bend must cover a greater distance and must therefore turn more rapidly than the wheels on the inside. The differential, ...

Mercedes-Benz M-Class Owners Manual
...

Service messages
Information on the type of service and service intervals (see separate Service Booklet). You can obtain further information from an authorized Mercedes-Benz Center or at http://www.mbusa.com (U ...