octane MERCEDES-BENZ CLK320 COUPE 2003 C209 Owner's Manual

13 Introduction
Operator’s Manual
Operating your vehicle outside the USA or Canada
If you plan to operate your vehicle in for-
eign countries, please be aware that:

Service facilities or replacement parts
may not be readily available,


unleaded gasoline for vehicles with cat-
alytic converters may not be available;
the use of leaded fuels will damage the
catalysts,


gasoline may have a considerably low-
er octane rating, and improper fuel can
cause engine damage.Certain Mercedes-Benz models are avail-
able for delivery in Europe under our Euro-
pean Delivery Program. For details, consult
your authorized Mercedes-Benz Center or
write to:
In the USA:
Mercedes-Benz USA, LLC
European Delivery Department
One Mercedes Drive
Montvale, NJ 07645-0350
In Canada:
Mercedes-Benz Canada, Inc.
European Delivery Department
849 Eglinton Avenue East
Toronto, Ontario M4G 2L5

251 Operation
At the gas station
At the gas station
The fuel filler flap is located on the
right-hand side of the vehicle towards the
rear. Locking/unlocking the vehicle with
the remote control or the SmartKey with
KEYLESS-GO* automatically locks/un-
locks the fuel filler flap.

Remove the key from the starter
switch.

Open the fuel filler flap by pushing at
the point indicated by the arrow.
The fuel filler flap springs open.

Turn the fuel cap to the left and hold on
to it until possible pressure is released.

Take off the cap and set it in the recess
on the fuel filler flap.
To prevent fuel vapors from escaping
into open air, fully insert filler nozzle
unit.

Only fill your tank until the filler nozzle
unit cuts out – do not top up or overfill.

Replace the fuel cap by turning it to the
right.
You will hear when the fuel cap is tight-
ened.

Close the fuel filler flap.
Warning!
G
Gasoline is highly flammable and poisonous.
It burns violently and can cause serious inju-
ry. Whenever you are around gasoline, avoid
inhaling fumes and skin contact, extinguish
all smoking materials. Never allow sparks,
flame or smoking materials near gasoline!
Warning!
G
Overfilling of the fuel tank may create pres-
sure in the system which could cause a gas
discharge. This could cause the gas to spray
back out when removing the fuel pump noz-
zle, which could cause personal injury.iOnly use premium unleaded gasoline
with a minimum Posted Octane Rating
of 91 (average of 96 RON / 86 MON).
Information on gasoline quality can
normally be found on the fuel pump.
More information on gasoline can be
found in the Factory Approved Service
Products pamphlet.

352 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 l)
approx. 12.8 US qt (12 l)
approx. 12.8 US qt (12 l)
MB 325.0 Anticorrosion/Antifreeze
Agent
Fuel tank
including a reserve of
16.35 US gal (62.0 l)
2.11 US gal (8.0 l)
Premium unleaded gasoline:
Posted Octane 91 (Avg. of 96
RON / 86 MON)
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 l)
MB Windshield Washer Concentrate
1
1Use MB Windshield Washer Concentrate “S” and water for temperatures above freezing or MB Windshield Washer Concentrate “S” and commercially available pre-
mixed windshield washer solvent / antifreeze for temperatures below freezing. Follow suggested mixing ratios (
page 357).

354 Technical dataFuels, coolants, lubricants, etc.Premium unleaded gasoline
Fuel requirements
Only use premium unleaded gasoline
meeting ASTM standard D 439:

The octane number (posted at the
pu mp ) m us t b e 91 mi n. It is an a ve ra ge
of both the Research (R) octane num-
ber and the Motor (M) octane number:
(R+M) / 2). This is also known as the
ANTI-KNOCK INDEX.
Unleaded gasoline containing oxygenates
such as ethanol, IPA, IBA and TBA can be
used provided the ratio of any one of these
oxygenates to gasoline does not exceed
10%; MTBE not to exceed 15%.
The ratio of methanol to gasoline must not
exceed 3% plus additional cosolvents.
Using mixtures of ethanol and methanol is
not allowed. Gasohol, which contains 10%
ethanol and 90% unleaded gasoline, can be
used.
These blends must also meet all other fuel
requirements, such as resistance to spark
knock, boiling range, vapor pressure, etc.
Gasoline additives
A major concern among engine manufac-
turers is carbon build-up caused by gaso-
line. Mercedes-Benz recommends only the
use of quality gasoline containing additives
that prevent the build up of carbon depos-
its.
After an extended period of using fuels
without such additives, carbon deposits
can build up especially on the intake valves
and in the combustion area, leading to en-
gine performance problems such as:

Warm-up hesitation


Unstable idle


Knocking/pinging


Misfire


Power loss
Do not blend any specific fuel additives
with fuel. This only results in unnecessary
cost and may be harmful to the engine op-
eration.
!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
3000 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.

364 Technical termsMemory function*
Used to store three individual seat,
steering wheel and mirror positions for
each key or, if so equipped, KEY-
LESS-GO* feature.
Menu
The control system displays are ar-
ranged in menus. Each menu contains
a number of commands for particular
systems. In the Audio menu, for exam-
ple, you will find the commands
Select
radio station
or Operate CD player
.
Using commands you can directly
change the settings for your vehicle.
MON
(M
otor O
ctane N
umber)
The Motor Octane Number for gasoline
as determined by a standardized meth-
od. It is an indication of a gasoline's
ability to resist undesired detonation
(knocking). The average of both the
MON (Motor Octane Number) and
->RON (Research Octane Number) is
posted at the pump, also known as AN-
TI-KNOCK INDEX.Multifunction display
Display field in the speedometer 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
of the tachometer dial. Avoid this en-
gi ne sp ee d ra nge , a s it m ay re su lt i n s e-
rious engine damage that is not
covered by the Mercedes-Benz Limited
Warranty.
Parktronic*
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 regular operationS and
winter operationW.
CLK 55 AMG with steering wheel gear-
shift control and manual shift program.
In addition toS andC (for regularS or
comfortC operation, see above) you
can use theM for manual shift
program.

365 Technical terms
Remote Vehicle Diagnostics
Transmission of vehicle data and cur-
rent location to the Mercedes-Benz
Customer Assistance Center for sub-
scribers to Tele Aid service.
REST
(Residual engine heat utilization)
Feature that uses the engine heat
stored in the coolant to heat the vehi-
cle interior for a short time after the en-
gine has been turned off.
Restraint systems
Seat belts, belt tensioners, airbags and
child restraint systems. As indepen-
dent systems, their protective func-
tions complement one another.RON
(R
esearch O
ctane N
umber)
The Research Octane Number for gaso-
line 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.Shift lock
When the vehicle is parked, this lock
prevents the transmission selector le-
ver from being inadvertently moved out
of positionP without key turned and
brake pedal depressed.
Speedshift
Steering wheel gearshift control and
manual shift program. In the manual
shift program mode you can change
the gears yourself on the steering
wheel or by using the selector lever.
SRS
(S
upplemental R
estraint S
ystem)
Seat belts, emergency tensioning de-
vice and airbags. Though independent
systems, they are closely interfaced to
provide effective occupant protection.

381 Index
Mirrors
Adjusting 38
Automatic antiglare for rear view mirror
149
Exterior rear view mirror 38
Exterior rear view mirror parking posi-
tion 150
Exterior rear view mirror parking posi-
tions 135
Inside rear view mirror 38
Storing exterior mirror parking position
103
MON 251
MON (Motor Octane Number) 364
Mph or km/h in speedometer 126
Multicontour seat* 100
Multifunction display 114, 364
Selecting language 127
Standard display 118
Multifunction display messages
ABS 284
BAS 285
Battery 303
Brake fluid 287
Brake pads 286
Check engine 280Coolant 290
Coolant level 289
Display 304
Distronic* 292
Doors 292
Engine 280
ESP 293
Fuel reserve tank 296
Hood 296
Key 296
Lamps 296–299
Parking brake 299
Selector lever 292
SmartKey with KEYLESS-GO* 288
Steering gear oil level 300
Tele Aid 301
Telephone* 301
Trunk 301
Washer fluid 301
Multifunction steering wheel 24, 115, 364
Buttons 115N
Navigation system
Operating 121
See separate COMAND* operating in-
structions
Night security illumination 107
O
Occupant safety 56
Airbags 57
Children and airbags 58
Children in the vehicle 66
Fastening the seat belt 40
Infant and child restraint systems 66
LATCH child seat mounts 71
Seat belts 40, 60
Odometer, main 23
Oil
Adding 255
Checking level 254
Consumption 254
Filler neck 255
Viscosity 363
Oil level
Checking 252

385 Index
Resetting
All functions (control system) 124
All functions of a submenu 124
Fuel consumption 137
Service indicator (FSS) 267
Stored speed in Distronic* 202
Trip odometer 112
Residual heat utilization 163, 365
Residual ventilation 163
REST (Residual engine heat utilization) 365
Restraint system see Infant and child re-
straint systems 66, 70
Rims 345
Roadside assistance 12
Tele Aid* 231
Rolling code programming 237
RON 251
RON (Research Octane Number) 365
Roof rack 212
Rotating wheels 263
Rubber parts
Cleaning 273S
Safety
Occupant 56
Safety belts see Seat belts 40
Safety defects
Reporting 18
Safety systems
Driving 74
Saving current speed 194
Searching
Radio station 120
Seat belt force limiter 65
Seat belts 62
Cleaning 273
Fastening 40
Proper use of 42, 64
Safety guidelines 60
Warning lamp 280
Seat cushion depth
Adjusting 100
Seat heater*
Switching off 101
Switching on 101Seats 97
Adjusting 34
Easy entry/exit feature 97
Heater* 101
Multicontour seat* 100
Rapid seat heating* 101
Split rear bench seat 215
Securing cargo
Cargo tie-down rings 218
Selecting
Display 127
Selecting display 128
Selector lever 23
Lock 43
Message in display 292
Position 23, 141
Self-test
BabySmart
TM airbag deactivation sys-
tem 68
Tele Aid* 228