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08 Starting and driving
08
286
* Option/accessory, for more information, see Introduction.
Automatic gearbox -- Powershift*
The Powershift automatic gearbox transmits
the motive force from the engine to the drive
wheels with double mechanical clutch discs,
as opposed to Geartronic which instead uses
a hydraulic torque converter.
D: Automatic gear positions. +S–: Manual gear
positions. S: Sport mode*.
Powershift transmission operates in the same
way and has similar controls and functions as
the Geartronic automatic transmission.
One exception is the function "Geartronic -
Winter mode" (p. 283):
•
Powershift enables driving away on a
slippery road surface if 2nd gear is
engaged manually - instead of 3rd gear
with Geartronic.
Towing
The model with Powershift transmission
should not be towed as it is dependent on the
engine running in order to receive sufficient
lubrication. If towing (p. 327) still has to take
place, the route must be as short as possible
and then at very low speed.
In the event of uncertainty as to whether the
car is equipped with Powershift or Geartronic
transmission, this can be verified by checking
the designation on the gearbox label under
the bonnet, Type designations (p. 417). The
designation ”MPS6” means that it is
Powershift transmission - otherwise it is
Geartronic automatic transmission.
See also important information in section
Towing (p. 327).
To bear in mind
The transmission's double clutch has over-
load protection that is activated if it becomes
too hot, e.g. if the car is held stationary with
the accelerator pedal on an uphill gradient for
a long time.
Overheated transmission causes the car to
shake and vibrate, and the warning symbol
illuminates and the combined instrument
panel shows a message. The transmission
can also overheat during slow driving in
queues (10 km/h or slower) on an uphill gradi-
ent, or with a trailer hitched. The gearbox
cools down when the car is stationary, with
foot brake depressed and the engine running
at idling speed.
Overheating during slow driving in queues
can be avoided by driving in stages:
•
Stop the car and wait with your foot on
the brake pedal until there is a moderate
distance to the traffic ahead, drive for-
ward a short distance, and then wait
another moment with your foot on the
brake pedal.
IMPORTANT
Use the foot brake to hold the car station-
ary on an uphill gradient - do not hold the
car with the accelerator pedal. The gear-
box could then overheat.
Text message and action
In some situations the combined instrument
panel may show a text message at the same
time as a symbol is illuminated.
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