Page 319 of 505

318 Operation
Engine compartment
CLK 350 / CLK 550
1Oil dipstick
2Upper (max) mark
3Lower (min) mark
CLK 63 AMG
1Oil dipstick
2Upper (max) mark
3Lower (min) mark
To check the engine oil level with the oil
dipstick, do the following:
Open the hood (page 315).
Pull out oil dipstick1.
Wipe oil dipstick1 clean.
Fully insert oil dipstick1 into the
dipstick guide tube.
Pull out oil dipstick1 again after
approximately 3 seconds to obtain ac-
curate reading.
The oil level is correct when it is be-
tween the lower (min) mark3 and
upper (max) mark2 of oil dipstick1.
If necessary, add engine oil.
For adding engine oil, see “Adding en-
gine oil” (
page 319).
For more information on engine oil, see
“Fuels, coolants, lubricants, etc.”
(
page 472).
For more information on messages in the
multifunction display concerning engine
oil, see the “Practical hints” section
(
page 394).
iCLK 350:
The filling quantity between the upper and lower
marks on the oil dipstick is approximately
2.1 US qt. (2.0 l).
CLK 550 / CLK 63 AMG:
The filling quantity between the upper and lower
marks on the oil dipstick is approximately
1.6 US qt. (1.5 l).
Page 320 of 505

319 Operation
Engine compartment
Adding engine oil
CLK 350 / CLK 550
1Filler cap
CLK 63 AMG
1Filler cap
Unscrew filler cap1 from filler neck.
Add engine oil as required. Be careful
not to overfill with oil.
Be careful not to spill any oil when adding.
Avoid environmental damage caused by oil
entering the ground or water.
Screw filler cap1 back on filler neck.
More information on engine oil can be
found in the “Technical data” section
(
page 472) and (page 474).
Transmission fluid level
The transmission fluid level does not need
to be checked. If you notice transmission
fluid loss or gear shifting malfunctions,
have an authorized Mercedes-Benz Center
check the automatic transmission.
!Only use approved engine oils and oil filters
required for vehicles with Maintenance System
(U.S. vehicles) or FSS (Canada vehicles). For a
listing of approved engine oils and oil filters,
refer to the Factory Approved Service Products
pamphlet in your vehicle literature portfolio, or
contact an authorized Mercedes-Benz Center.
Using engine oils and oil filters of specification
other than those expressly required for the
Maintenance System (U.S. vehicles) or FSS
(Canada vehicles), or changing of oil and oil filter
at change intervals longer than those called for
by the Maintenance System (U.S. vehicles) or
FSS (Canada vehicles) will result in engine or
emission control system damage not covered by
the Mercedes-Benz Limited Warranty.
!Excess oil must be siphoned or drained off.
It could cause damage to the engine and emis-
sion control system not covered by the
Mercedes-Benz Limited Warranty.
Page 478 of 505

477 Technical data
Fuels, coolants, lubricants, etc.
Coolants
The engine coolant is a mixture of water
and anticorrosion / antifreeze, which
provides:
Corrosion protection
Freeze protection
Boiling protection (by increasing the
boiling point)
The cooling system was filled at the factory
with a coolant providing freeze protection
to approximately -22°F (-30°C) and
corrosion protection.
If the antifreeze mixture is effective
to -22°F (-30°C), the boiling point of the
coolant in the pressurized cooling system
is reached at approx. 266°F (130°C).The coolant solution must be used
year-round to provide the necessary corro-
sion protection and increase boil-over pro-
tection. Refer to Maintenance Booklet for
replacement interval.
Coolant system design and coolant used
determine the replacement interval. The
replacement interval published in the
Maintenance Booklet is only applicable if
MB 325.0 Anticorrosion/Antifreeze solu-
tion or other Mercedes-Benz approved
products of equal specification (see Facto-
ry Approved Service Products pamphlet)
are used to renew the coolant concentra-
tion or bring it back up to the proper level.
To provide important corrosion protection,
the solution must be at least 45% anticor-
rosion/antifreeze (equivalent to freeze
protection to approx. -22°F [-30°C]). If you
use a solution that is more than 55% anti-
corrosion/antifreeze (freeze protection to
approx. -49°F [-45°C]), the engine temper-
ature will increase due to the lower heat transfer capability of the solution. There-
fore, do not use more than this amount of
anticorrosion/antifreeze.
If the coolant level is low, water and MB
Anticorrosion /Antifreeze should be used
to bring it up to the proper level (have cool-
ing system checked for signs of leakage).
Please make sure the mixture is in accor-
dance with label instructions.
The water in the cooling system must meet
minimum requirements, which are usually
satisfied by normal drinking water. If you
are not sure about the water quality,
consult an authorized Mercedes-Benz
Center.
!Add premixed coolant solution only. Adding
water and MB 325.0 Anticorrosion/Antifreeze
separately from each other, could cause engine
damage not covered by the Mercedes-Benz
Limited Warranty
Page 487 of 505

486 Index
Emergency tensioning device see ETD
Emergency, In case of
Battery,Jump starting 290, 450
First aid kit 404
Flat tire, Changing 436
Fuses 456
Hazard warning flasher 133
Roadside Assistance 12
Towing the vehicle 452
Emission control 310
Emission control information label 463
Emission control vacuum line
routing diagram label 463
Emission system warranties 10
Engine
Belt layout 464
Block heater (Canada only) 352
Break-in recommendations 300
Cleaning 358
Compartment 315
Malfunction
indicator lamp 27, 369, 370
Maximum engine speed 465
Messages in display 390
Number 463Starting 50
Starting difficulties 52
Starting with KEYLESS-GO* 51
Starting with SmartKey 51
Technical data 465
Turning off 60
Turning off with KEYLESS-GO* 60
Turning off with SmartKey 60
Engine coolant see Coolant
Engine oil 317, 474
Adding 319, 474
Additives 474
Changing 319, 474
Checking level (Dipstick) 317
Consumption 317
Filler cap 319
Filler neck 319
Engine oil level 314
ESP
®27, 90
Messages in display 380–381
Warning lamp 372
ETD 79
Safety guidelines 67
Exterior rear view mirrors 45, 184
Exterior view 22F
Filler cap, Engine oil 319
Filler neck, Engine oil 319
First aid kit 404
Flat tire 436
Jacking up the vehicle 441
Lowering the vehicle 445
Minispare wheel 407
Mounting the spare wheel 441
Preparing the vehicle 436
TIREFIT (CLK 63 AMG only) 404
TIREFIT kit* 436
Flexible Service System see
FSS (Canada vehicles)
Floormats* 283
Fluids
Brake fluid 314, 475
Engine coolant 320, 477
Engine oil 317, 474
Transmission fluid 319
Windshield washer and headlamp
cleaning* system 322, 479
Fog lamps 130, 428
Messages in display 397
Replacing bulbs 428
Front air bags 69