Mercedes-Benz M-Class 2013 Owners Manual - Manual (Page 174)

Kickdown
You can also use kickdown for maximum
acceleration in manual drive program M.
X Depress the accelerator pedal beyond the
pressure point.
The automatic transmission shifts to a
lower gear depending on the engine speed.
X Shift back up once the desired speed is
reached.
i All vehicles (except AMG vehicles): if
you apply full throttle, the automatic
transmission shifts up to the next gear
when the maximum engine speed is
reached. This prevents the engine from
overrevving.
i AMG vehicles: it is not possible to use
kickdown in manual drive program M.
Switching off the manual drive program
X Press the program selector button
(
Y
page 169) repeatedly until C or S
appears in the multifunction display.
172
Automatic transmission
Driving
and
parking