Page 205 of 473

204 Controls in detail
Audio system
Program categories
The channels are categorized. Categories
allow you to tune to stations broadcasting
a certain type of program (category mode)
(
page 206).Calling up the SAT main menu
Press SAT soft key.
SAT is displayed in the upper left-hand
corner of the display.
Prior to activation of the satellite radio
service (
page 204).
After activation of satellite radio
service (
page 205).
Prior to activation of the satellite radio
service
The telephone number of the SIRIUS
Service Center (888-539-7474) is
displayed.
iAdditional satellite radio equipment and a
subscription to a satellite radio service provider
are required for the satellite radio operation
described here.
Contact an authorized Mercedes-Benz Center
for details and availability for your vehicle.
Note that categories and channels shown in
illustrations are dependent on programming
content delivered by the service provider.
Programming content is subject to change.
Therefore, channels and categories shown in
illustrations and descriptions contained in
this manual may differ from the channels and
categories delivered by the service provider.iSatellite radio service may be unavailable
or interrupted from time to time for a variety of
reasons, such as environmental or topographic
conditions and other things beyond the service
provider’s or our control. Service might also not
be available in certain places (e.g., in tunnels,
parking garages, or within or next to buildings) or
near other technologies.
Page 206 of 473

205 Controls in detail
Audio system
Press ESN soft key.
The twelve-digit electronic serial
number (ESN) of the SAT tuner*
installed in your vehicle is displayed.
This information is required to call the
SIRIUS Service Center for an activation
request.
After activation of the satellite radio
service
The satellite radio main menu appears.
The radio station selected last is audible,
provided it can be received.The first channel 001 is called up and the
PTY system changes to All categories.
If no station can be received,
ACQUIRING
appears in the display.
If the Satellite radio service is not
activated,
ACQUIRING will also appear in the
radio display and
NO SAT will appear in the
multifunction display.Selecting a station
The following options are available:
Selecting a station using the selected
category (
page 206).
Tuning via station presets
(
page 205).
Tuning via scan search (page 207).
Tuning via manual channel input
(
page 206).
Tuning via the program category list
(
page 206).
Tuning via station presets
Ten satellite radio station presets are
available.
You can access the presets via number
keys.
iCredit card information may also be
required for your application.
The activation process takes approximately
5 to 10 minutes after calling the SIRIUS Service
Center.
iThe system will tune to a default station if no
station had been selected previously.
Page 226 of 473

225 Controls in detail
Audio system
Muting a call
It is possible to mute a call; the caller is
then no longer able to hear you.
Mute on
PressMUT soft key.
MIC MUTE will appear in the display.
Mute off
PressMUT soft key again.
Terminating a call
Press t button.
The current call is terminated and the
muted audio source becomes active
again.Talking with two callers at the same
time
If you wish to receive or place another call
during an already active call, you can
accept or place the second call and switch
between the callers or combine them into
one call. Note that the feature described
here is dependent on availability from your
mobile phone service provider.
Placing/accepting a second call
Place new call by entering
telephone number manually.
Press s button.
You are connected to the second
caller; the first caller is kept on
hold.
or
Press s button to accept a
second call.You are connected with the second
caller; the first caller is kept on hold.
Switching between calls
Press 2 and s buttons.
This switches between the calls.
The non-active call is kept on hold.
Terminating a call
Press t button.
The current call is terminated. You
are again connected with the caller
previously placed on hold.
iYou will be notified of the second call acous-
tically, but you will not see this in the display.
Page 233 of 473

232 Controls in detail
Audio system
Switching between calls
Press s button.
This switches between the calls.
The non-active call is kept on hold.
Terminating a call
Press t button.
The current call is terminated. The
connection to the caller previously
kept on hold is also interrupted;
however, reconnection is indicated
by an acoustic signal.Placing a second call
If you wish to place another call during an
already active call, you can place the
second call and switch between the callers
or combine them into one call. Note that
this feature is dependent on availability
from your mobile phone service provider.
Placing a second call
Place a new call by entering
telephone number manually.
Press s button.
You are connected to the second
caller; the first caller is kept on
hold.
Terminating a call
Press t button.
The current call is terminated. The
connection to the caller previously
kept on hold is also interrupted;
however, reconnection is indicated
by an acoustic signal.
Combining two calls
Press s button.
The calls are combined into one
call.
Terminating a combined call
Press t button.
The connection to both callers is
terminated.
Page 260 of 473

259 Controls in detail
Useful features
When the mobile phone is inserted in the
cradle, you can operate the telephone
using the following devices:
mobile phone keypad
COMAND* (see separate operating in-
structions)
buttonss andt on the multi-
function steering wheel (
page 149)
audio system (page 219)Please note that these functions are only
available with Mercedes-Benz approved
mobile phones. Please contact an autho-
rized Mercedes-Benz Center for informa-
tion on features available for your mobile
phone of choice.
The cradle is located in the front center
armrest.
Open the telephone* compartment or,
depending on production date, open
the storage compartment, see
“Storage/telephone* compartment
under armrest” (
page 252).Inserting mobile phone in mobile phone
cradle
Once the mobile phone has been inserted
in the mobile phone cradle, you have to
use the hands-free device to respond
during phone calls.
If applicable, remove the cover for the
external antenna connection from the
back of the mobile phone and store it in
a safe place. Be sure to comply with the
mobile phone’s operating instructions
as well.
iVarious mobile phone cradles can be in-
stalled in the center armrest, see separate in-
stallation instructions for the mobile phone
cradle. These mobile phone cradles can be
obtained from an authorized Mercedes-Benz
Center.
The functions and services available to you while
using the mobile phone depend on your service
provider and the type of mobile phone you are
using. See also separate operating manual for
instructions on how to use your mobile phone.
iDepending on production date, your vehicle
may be equipped with a storage compartment
only. The mobile phone cradle is then located in
the storage compartment (
page 252).
!Do not try to remove the mobile phone along
with the cradle. You could otherwise damage the
mobile phone cradle.
Page 265 of 473

264 Controls in detail
Useful features
A voice connection between the Response
Center and the occupants of the vehicle
will be established automatically soon af-
ter the emergency call has been initiated.
The Response Center will attempt to deter-
mine more precisely the nature of the
emergency provided they can speak to an
occupant of the vehicle.
The Tele Aid system is available if:
it has been activated and is operation-
al. Activation requires a subscription
for monitoring services, connection
and cellular air time.
the relevant cellular phone network
and GPS signals are available and pass
the information on to the Response
Center.Initiating an emergency call manually
1Cover
2SOS button
Briefly press on cover1.
The cover opens.iLocation of the vehicle on a map is only
possible if the vehicle is able to receive signals
from the GPS satellite network and pass the
information on to the Response Center.
Warning!G
If the indicator lamp in the SOS button is
flashing continuously and there was no
voice connection to the Response Center
established, then the Tele Aid system could
not initiate an emergency call (e.g. the rele-
vant cellular phone network is not available).
The message
Call failed appears in the
multifunction display for approximately
10 seconds.
Should this occur, assistance must be sum-
moned by other means.
Page 444 of 473

443 Technical data
Fuels, coolants, lubricants, etc.
Fuels, coolants, lubricants, etc.
Capacities
Vehicle components and their respective
lubricants must match. Therefore, only use
products tested and approved by
Mercedes-Benz.
Please refer to the Factory Approved
Service Products pamphlet (USA only), or
inquire at an authorized Mercedes-Benz
Center.
Warning!G
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 you skin or clothing.
If a service fluid is swallowed, contact a
physician immediately.
ModelCapacityFuels, coolants, lubricants etc.
Engine with oil filterAll models8.5 US qt (8.0 l)Approved engine oils
Automatic transmission*SLK 280, SLK 3509.5 US qt (9.0 l)MB Automatic Transmission Fluid
SLK 55 AMG9.2 US qt (8.7 l)
Manual transmissionSLK 280, SLK 3501.6 US qt (1.5 l)MB Manual Transmission Oil
Rear axleSLK 2801.1 US qt (1.0 l)Hypoid gear oil SAE 85 W 90
SLK 3501.2 US qt (1.1 l)
SLK 55 AMG1.3 US qt (1.2 l)
Page 456 of 473

455 Index
Delayed shut-off
Exterior lamps 144
Interior lighting 145
Department of Transportation see DOT
Difficulties
Wile driving 58
With starting the engine 52
Digital speedometer 128
Dimensions, Vehicle 441
Dipstick see Oil dipstick
Direction of rotation (Tires) 307
Display text see Messages in the
multifunction display
Displays
Digital speedometer 128
Maintenance service indicator 334
Multifunction display 121
Outside temperature 128
Symbol messages 366
Text messages 358
Vehicle status message memory 135
Vehicle status messages 356Distance to empty (range), Trip
computer 149
Door
Control panel 34
Entry lamps 117
Locking in an emergency 388
Locking/unlocking, SmartKey 94
Opening from inside 99
Remote door unlock, Tele Aid* 269
Unlocking in an emergency 387
DOT 328
Drink holder see Cup holder
Drinking and driving 279
Driver’s air bag see Air bagsDriving 53
Abroad 287
Accelerator position 159
Automatic transmission* 53
Driving off 282
Fuel saving 279
Hydroplaning 284
In winter 286
Instructions 48, 279
Kickdown 159
Manual transmission 53
Standing water 287
Tires 283
Driving safety systems 84
ABS 84
BAS 86
Electronic traction system 88
ESP
®86
Driving systems
Cruise control 247
Driving tips 159