382 Operation
Engine compartment
Adding engine oil
Example GL 450 (GL 320 CDI similar)
1Filler cap
Unscrew filler cap1 from filler neck.
Add engine oil as required. Never over-
fill 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.
For more information on engine oil, see
“Technical data” section (
page 560) and
(
page 562).
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 Light
Truck Center check the automatic trans-
mission.
Coolant level
The engine coolant is a mixture of water
and anticorrosion/antifreeze. To check the
coolant level, the vehicle must be parked
on level ground.
!Only use approved engine oils and oil filters
required for vehicles with Maintenance System.
For a listing of approved engine oils and oil
filters, refer to the Factory Approved Service
Products pamphlet (USA only) in your vehicle
literature portfolio, or contact an authorized
Mercedes-Benz Light Truck Center.
Using engine oils and oil filters of specification
other than those expressly required for the
Maintenance System, or changing of oil and oil
filter at change intervals longer than those called
for by the Maintenance System 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/or
catalytic converter (gasoline engine) or the oxi-
dation catalyst (diesel engine) not covered by
the Mercedes-Benz Limited Warranty.
565 Technical data
Fuels, coolants, lubricants
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 -35°F (-37°C) and corro-
sion protection.If the antifreeze mixture is effective to
-35°F (-37°C), the boiling point of the cool-
ant in the pressurized cooling system is
reached at approximately 266°F (130°C).
The coolant solution must be used year
round to provide the necessary corrosion
protection and increase boil-over protec-
tion. 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 are used to
renew the coolant concentration or bring it
back up to the proper level.
For information on other Mercedes-Benz
approved products of equal specification,
refer to the Factory Approved Service
Products pamphlet (USA only) or contact
an authorized Mercedes-Benz Light Truck
Center.To provide important corrosion protection,
the solution must be at least 50% anticor-
rosion/antifreeze (equivalent to freeze
protection to approximately -35°F
[-37°C]). If you use a solution that is more
than 55% anticorrosion/antifreeze (freeze
protection to approximately -49°F
[-45°C]), the engine temperature will
increase due to the lower heat transfer
capability of the solution. Therefore, do not
use more than this amount of anticorro-
sion/antifreeze.
If the coolant level is low, water and
MB 325.0 Anticorrosion/Antifreeze
should be used to bring it up to the proper
level (have cooling system checked for
signs of leakage). Please make sure the
mixture is in accordance with label instruc-
tions.
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, con-
sult an authorized Mercedes-Benz Light
Truck 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.
575 Index
Emergency operation
Fuel filler flap 501
Locking/unlocking the vehicle 500,
501
Power tilt/sliding sunroof*,
Manual operation 503
Emergency operation
(Limp-Home Mode) 202
Emergency operations
Exit for third-row seats 134
Remote door unlock, Tele Aid 338
Tailgate, Opening from the inside
manually 124
Emergency Tensioning Device see ETD
Emergency, In case of
Battery, Jump starting 538
Engine shut-down 546
First aid kit 495
Flat tire 523
Fuses 544
Hazard warning flasher 151
Instrument cluster, Indicator
lamps 436, 437, 438, 439, 440,
441, 442, 443, 444, 445, 446
Roadside Assistance 12, 336
Towing the vehicle 540Emission control 373
Information label 551
System warranties 10
Vacuum line routing diagram
label 551
Engine
Belt layout 552
Belt layout (GL 320 CDI) 552
Break-in recommendations 381
Cleaning 427
Compartment 379
Emergency engine shut-down 546
Malfunction indicator lamp 29, 472
Maximum engine speed 156, 553
Messages in the
multifunction display 472
Number 551
Starting 57
Starting with KEYLESS-GO* 59
Starting with the SmartKey 58
Tachometer 29, 156
Technical data 553
Turning off with KEYLESS-GO* 70
Turning off with the SmartKey 70Engine coolant see Coolant
Engine oil 381, 562
Adding 382, 562
Additives 562
Changing 382, 562
Checking level 381
Checking with the oil dipstick 381
Consumption 381
Filler neck 382
Messages in the
multifunction display 476
Recommended engine oils and oil
filters 562
Enhanced Off-road Package*
Vehicle level control 285
ESP® 27, 105
Four wheel electronic traction system
with ESP® 105
Messages in the
multifunction display 459, 460
Off-road-ESP® 108
Warning lamp 27, 441, 442
