Mercedes-Benz GL-Class: Important safety notes - Service products and capacities - Technical data - Mercedes-Benz GL-Class Owner's ManualMercedes-Benz GL-Class: Important safety notes

Service products include the following:

fuels (e.g. gasoline, diesel)
additives for exhaust gas aftertreatment (DEF)
lubricants (e.g. engine oil, transmission oil)
coolant
brake fluid
windshield washer fluid

Vehicle components and their respective lubricants must match. You should therefore only use products that have been tested and approved by Mercedes-Benz.

Information on tested and approved products can be obtained at a Mercedes-Benz Center or on the Internet at http://www.mbusa.com (USA only).

WARNING Comply with all valid regulations with respect 
Comply with all valid regulations with respect to handling, storing and disposing of service fluids. Otherwise, you could endanger persons or the environment.
Keep service fluids out of the reach of children.
For health reasons, you should prevent service fluids from coming into direct contact with your skin or clothing.
If a service fluid is swallowed, contact a physician immediately.

    See also:

    Following Distance
    Stay at least twice as far behind the vehicle ahead as you would when driving the vehicle without a trailer. This can help to avoid heavy braking and sudden turns. ...

    Headlight washer (if so equipped)
    The headlight washer operates when the headlight is on and the ignition switch is in the ON position. Pull the windshield washer switch toward you. The headlight washer operates with the win ...

    Transfer Case
    If the vehicle is equipped with All-Wheel Drive, be sure to perform the lubricant checks described in this section. ...