442 Technical termsMemory function
Used to store three individual seat, 
steering wheel and mirror positions for 
each SmartKey or SmartKey with 
KEYLESS-GO*.
MON
The Motor Octane Number for gasoline 
as determined by a standardized 
method. It is an indication of a gaso-
line’s ability to resist undesired detona-
tion (knocking). The average of both 
the MON (Motor Octane Number) and 
RON (Research Octane Number) is 
posted at the pump, also known as 
ANTI-KNOCK INDEX.
Multifunction display
Two display fields in the instrument 
cluster used to present information 
provided by the control system.Multifunction steering wheel
Steering wheel with buttons for operat-
ing the control system.
Overspeed range
Engine speeds within the red marking 
on the tachometer dial, see “Tachome-
ter” (
page 132). Avoid this engine 
speed range, as it may result in serious 
engine damage that is not covered by 
the Mercedes-Benz Limited Warranty.
Parktronic (Parking assist)*
System which uses visual and acoustic 
signals to assist the driver during park-
ing maneuvers.
Poly-V-belt drive
Drives engine-components (alternator, 
AC compressor, etc.) from the engine.Power train
Collective term designating all compo-
nents used to generate and transmit 
motive power to the drive axles, includ-
ing
engine
clutch/torque converter
transmission
transfer case
drive shaft
differential
axle shafts/axles
Program mode selector switch
Used to switch the automatic transmis-
sion between standard operation (S) 
and comfort operation (C).
SL 55 AMG with steering wheel gear-
shift control and manual shift program: 
in addition to S and C (for regular S or 
comfort C operation, see above), you 
can use MANUAL for manual shift pro-
gram