Page 340 of 498

338 OperationTires and wheelsTire and loading terminology
Accessory weight
The combined weight (in excess of those
standard items which may be replaced) of
automatic transmission, power steering,
power brakes, power windows, power
seats, radio, and heater, to the extent that
these items are available as
factory-installed equipment (whether
installed or not).
Air pressure
The amount of air inside the tire pressing
outward on each square inch of the tire.
Air pressure is expressed in pounds per
square inch (psi), or kilopascal (kPa) or
bars.
Aspect ratio
Dimensional relationship between tire
section height and section width
expressed in percentage.Bar
Another metric unit for air pressure. There
are 14.5038 pounds per square inch (psi)
to 1 bar; there are 100 kilopascals (kPa)
to 1 bar.
Bead
The tire bead contains steel wires wrapped
by steel cords that hold the tire onto the
rim.
Cold tire inflation pressure
Tire inflation pressure when your vehicle
has been sitting for at least three hours or
driven no more than one mile (1.6 km).
Curb weight
The weight of a motor vehicle with stan-
dard equipment including the maximum
capacity of fuel, oil, and coolant, and, if so
equipped, air conditioning and additional
optional equipment, but without passen-
gers and cargo.DOT (D
epartment o
f T
ransportation)
A tire branding symbol which denotes the
tire meets requirements of the
U.S. Department of Transportation.
GAWR (G
ross A
xle W
eight R
ating)
The GAWR is the maximum permissible
axle weight. The gross vehicle weight on
each axle must never exceed the GAWR for
the front and rear axle indicated on the
certification label located on the driver’s
door B-pillar.
GVW (G
ross V
ehicle W
eight)
The GVW comprises the weight of the
vehicle including fuel, tools, spare wheel,
installed accessories, passengers and
cargo and, if applicable, trailer tongue
load. The GWV must never exceed the
GWVR indicated on the certification label
located on the driver’s door B-pillar.
Page 439 of 498
437 Technical data
Layout of poly-V-belt drive
Layout of poly-V-belt drive
CLK 320/CLK 500/CLK 55 AMG
1Automatic belt tensioner
2Power steering pump
3Air conditioning compressor
4Crankshaft
5Coolant pump
6Generator (alternator)
7Idler pulley
Page 450 of 498
448 Technical dataFuels, coolants, lubricants, etc.
Model
Capacity
Fuels, coolants, lubricants, etc.
Cooling system
CLK 320
CLK 500
CLK 55 AMG
approx. 10.7 US qt (10.0 l)
approx. 12.8 US qt (12.0 l)
approx. 12.8 US qt (12.0 l)
MB 325.0 Anticorrosion/Antifreeze
Agent
Fuel tank
including a reserve of
CLK 320
CLK 500
CLK 55 AMG
16.35 US gal (62.0 l)
2.11 US gal (8.0 l)
2.11 US gal (8.0 l)
2.64 US gal (10.0 l)
Premium unleaded gasoline:
Minimum Posted Octane 91
(Avg.of96RON/86MON)
Air conditioning system
R-134a refrigerant and special PAG lu-
bricant oil (never R-12)
Windshield washer and
headlamp cleaning system*
6.4 US qt (6.0 l)
MB Windshield Washer Concentrate
1
1Use MB Windshield Washer Concentrate “S” and water for temperatures above freezing point or MB Windshield Washer Concentrate “S” and commercially available
premixed windshield washer solvent / antifreeze for temperatures below freezing point. Follow suggested mixing ratios (page 454).
Page 452 of 498

450 Technical dataFuels, coolants, lubricants, etc.Air conditioning refrigerant
R-134a (HFC) refrigerant and special PAG
lubricating oil are used in the air
conditioning system.
Never use R-12 (CFC) or mineral-based
lubricating oil. Otherwise damage to the
system will occur.
Brake fluid
During vehicle operation, the boiling point
of the brake fluid is continuously reduced
through the absorption of moisture from
the atmosphere. Under extremely strenu-
ous operating conditions, this moisture
content can lead to the formation of bub-
bles in the system, thus reducing the sys-
tem’s efficiency.
Therefore, the brake fluid must be
replaced every two years, preferably in the
spring.
Only brake fluid approved by
Mercedes-Benz is recommended. Your
authorized Mercedes-Benz Center will
provide you with additional information.
Premium unleaded gasoline
!To maintain the engine’s durability and
performance, premium unleaded gaso-
line must be used. If premium unleaded
is not available and low octane fuel is
used, follow these precautions:
Have the fuel tank only partially
filled with unleaded regular and fill
up with premium unleaded as soon
as possible.
Avoid full throttle driving and abrupt
acceleration.
Do not exceed an engine speed
of 3 000 rpm if the vehicle is loaded
with a light load such as two per-
sons and no luggage.
Do not exceed
2/3 of maximum ac-
celerator pedal position if the vehi-
cle is fully loaded or operating in
mountainous terrain.
Page 463 of 498

461 Index
A
ABS 25, 84, 455
Malfunction indicator lamp 354
Messages in display 365
Accelerator position,
automatic transmission 171
Accessory weight 338
Accident
In case of 54
Activating
Air conditioning (cooling) 192, 204
Air recirculation mode 190, 201
Anti-theft alarm system 90
Automatic climate control 195
Central locking (control system) 158
Charcoal filter 203
Climate control 185
Climate control system 187
Defrosting 189
Automatic climate control 200
Easy-entry/exit feature 159
Electric air pump 417
ESP 88Exterior headlamps 50
Exterior lamps 125
Exterior rear view
mirror parking position 180
Front and rear fog lamp 128
Hazard warning flasher 131
Headlamps 50
High beams 129
Ignition 34
Ignition with KEYLESS-GO* 36
Immobilizer 56, 89
Rear window defroster 183
Residual heat 205
Seat heating* 119
Seat ventilation* 120
Tow-away alarm 91, 92
Windshield wipers 52
Adding
Coolant 313
Engine oil 312
Additional turn signals 404
Adjustable air vents, rear
passenger compartment 193, 206Adjusting 37
Air distribution 188, 198
Air volume 199
Backrest tilt 38
Exterior rear view mirror 41
Head restraint height 38
Head restraint tilt 39
Instrument cluster illumination 134
Interior rear view mirror 41
Mirrors 41
Multicontour seat* 118
Seat cushion depth 118
Seat cushion tilt 38
Seat fore and aft adjustment 38
Seat height 38
Seats 37
Steering column in/out 41
Steering column up/down 41
Steering wheel 40
Aids for changing fuses 430
Page 464 of 498

462 IndexAir bags 61
Children 62
Front 65
Passenger 65
Safety guidelines 64
Side impact 66
Window curtain 66
Air conditioning (cooling) 191
Turning off 192, 204
Turning on 192, 204
Air conditioning refrigerant 450
Air distribution
Adjusting 188, 198
Air pressure 338
Air pressure see Tire inflation pressure
Air pump, electric
Turning on 417
Air recirculation mode 190, 201
Activating 190, 201
Deactivating 191, 202
Air vents, rear passenger compartment
Adjustable 193, 206
Air volume
Adjusting 199Alarm
Audible 83, 91, 92
Canceling 91, 92
Visual 90
Alarm system
Anti-theft 90
Alignment bolt (vehicle tool kit) 415, 455
Anticorrosion/antifreeze 453
Antiglare
Auto-dimming 178
Antilock brake system (ABS) 455
Anti-theft alarm system
Arming 90
Canceling alarm 91, 92
Disarming 91
Anti-theft systems 89
Anti-theft alarm system 90
Immobilizer 89
Tow-away alarm 91
Aquaplaning see Hydroplaning
Armrest
Front 273
Rear 274
Storage compartments 273Ashtray (Center console) 276
Opening 276
Reinstalling 276
Removing 276
Ashtray (Rear seat) 276
Opening 277
Reinstalling 277
Removing 277
Aspect ratio 338
At the gas station 305
ATF (automatic transmission fluid) 312
AUDIO menu 143
Operate CD player 144
Selecting radio station 143
Selecting satellite radio* station 143
Audio system 207
Audio and telephone, operation 207
Button and soft key operation 210
CD operation 225
Operating and display elements 208
Operating safety 207
Operation 210
Radio operation 215
Switching off 211
Switching on 210
Telephone* operation 232
Page 469 of 498

467 Index
Convenience submenu 158
Activating
easy-entry/exit feature 159
Setting key-dependency 160
Setting parking position for
exterior rear view mirror 160
Coolant 313, 452
Adding 313
Anticorrosion/antifreeze
quantity 452
Capacities 447
Checking level 313
Messages in display 375
Temperature 304
Temperature indicator 135
Warning lamp 357, 376
Coolant level
Checking 313
Cornering fog lamps* 130
Driving forward 130
Driving rearward 131Cruise control 255, 456
Canceling 257
Driving downhill 257
Driving uphill 257
Fine adjustment 259
Messages in display 367
Setting current speed 256
Setting to last stored speed
("Resume" function) 259
Cruise control lever 255
Cup holder
Cleaning 351
Closing 275
In rear seat armrest 275
In the dashboard 275
Opening 275
Curb weight 338
Customer Assistance Center (CAC) 455D
Date (day)
Setting 153
Date (month)
Setting 153
Date (year)
Setting 154
Daytime running lamp mode 126
Setting 155
Deactivating
Air conditioning (cooling) 192, 204
Air recirculation mode 191, 202
Alarm 91
Anti-theft alarm system 91
Automatic climate control 195
Central locking (control system) 158
Charcoal filter 203
Climate control 185
Climate control system 187
Defrost 200
Defrosting 189
Engine with KEYLESS-GO* 57
Engine with the SmartKey 56
ESP 87
Exterior lamps 125
Hazard warning flasher 131
Page 482 of 498

480 IndexPremium unleaded gasoline 450
Problems
While driving 54
With vehicle 17
Product information 9
Production options weight 339
Program mode selector switch 458
Automatic transmission 170
PSI 339
Q
Quick search
Phone book* 164R
Radio
Selecting stations 143
Selecting stations (satellite*) 143
Radio operation 215
Radio transmitters,
control and operation 302
Range (distance to empty)
Calling up 162
Reading lamp 29
Rear bench seat
Foldable 267
Rear fog lamp 405
Bulb 405
Switching on 128
Rear lamp bulbs
Replacing 410
Rear lamps see Tail lamps
Rear passenger compartment
Adjustable air vents 193, 206Rear seat head restraints
Folding back with release button 116
Folding back with switch 116
Installing 117
Placing upright 116
Rear seats 115
Removing 117
Rear seats
Rear seat head restraints 115
Rear view mirrors auto-dimming 178
Rear view mirrors see Mirrors
Rear window
Blocking operation 82
Rear window defroster 183
Activating 183
Deactivating 183
Rear window sunshade* 182
Recommended inflation pressure 339
Reconnecting
Vehicle battery 422
Refrigerant
Air conditioning 450
Refueling 305
Regular checks 307
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