Making adjustments in 5 mph (Canada: 10 km/h) increments

lever Briefly press the cruise control lever beyond the pressure point, up 1 for a higher speed or down 2 for a lower speed.
The last speed stored is increased or reduced.

    See also:

    Snow chains
    For safety reasons, Mercedes-Benz recommends that you only use snow chains that have been specially approved for your vehicle by Mercedes-Benz, or are of a corresponding standard of quality. ...

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    Notes on selecting, mounting and replacing tires
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