2025-2026 Mercedes G Class SUV Technical data -> Operating fluids User Manual
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Technical data -> Operating fluids for Your Mercedes G Class SUV Fifth Generation (2025-2026)

705
Operating fluids
Notes on operating fluids
&
WARNING
Risk of injury due to harmful operating fluids
Operating fluids can be toxic.
#
When using, storing and disposing of operating fluids, observe
the imprints on the respective original containers.
#
Always keep operating fluids in the sealed original container.
#
Always keep children away from operating fluids.
+
ENVIRONMENTAL NOTE
Pollution of the environment due to irresponsible disposal of
operating fluids
Incorrect disposal of operating fluids can cause considerable damage to
the environment.
#
Dispose of operating fluids in an environmentally responsible
manner.
OPERATING FLUIDS INCLUDE THE FOLLOWING:
R
lubricants
R
coolant
R
brake fluid
R
windscreen washer fluid
R
climate control system refrigerant
Only use products approved by Mercedes-Benz. Damage to the vehicle caused
by the use of products that have not been approved is not covered by the
Mercedes-Benz warranty or goodwill gestures.
You can identify operating fluids approved by Mercedes-Benz by the following
inscriptions on the container:
R
MB-Freigabe (e.g. MB-Freigabe 229.51)
R
MB-Approval (e.g. MB-Approval 229.51)
FURTHER INFORMATION ON APPROVED OPERATING FLUIDS IS AVAILA‐
BLE AT THE FOLLOWING LOCATIONS:
R
in the Mercedes-Benz Specifications for Operating Fluids in accordance
with the details on the label
-
at https://-
R
at a qualified specialist workshop
Notes on brake fluid
Observe the notes on operating fluids (/page705).
G-Class - Owner's Manual
Technical data Operating fluids
F465 0034 02
706
&
WARNING
Risk of an accident due to vapour pockets forming in the brake
system
The brake fluid constantly absorbs moisture from the air. This lowers
the boiling point of the brake fluid. If the boiling point is too low, vapour
pockets may form in the brake system when the brakes are applied
hard.
This impairs the braking effect.
#
Have the brake fluid renewed at the specified intervals.
Have the brake fluid regularly replaced at a qualified specialist workshop.
Only use a brake fluid approved by Mercedes-Benz in accordance with MB-
Freigabe or MB-Approval 331.0.
Coolant
NOTES ON COOLANT
Observe the notes on operating fluids (/page705).
&
WARNING
Risk of fire‑ and injury from antifreeze
If antifreeze comes into contact with hot component parts in the engine
compartment, it may ignite.
#
Allow the drive system to cool down before you top up the
antifreeze.
#
Make sure that no antifreeze spills out next to the filler open‐
ing.
#
Thoroughly clean the antifreeze from component parts before
starting the vehicle.
*
NOTE
Damage caused by incorrect coolant
#
Only use coolant that has been premixed with the required
antifreeze protection.
INFORMATION ON COOLANT IS AVAILABLE AT THE FOLLOWING
LOCATIONS:
R
In the Mercedes-Benz Specification for Operating Fluids 320.1
-
At https://-
R
At a qualified specialist workshop
G-Class - Owner's Manual
Technical data Operating fluids
F465 0034 02
707
*
NOTE
Overheating at high outside temperatures
If an inappropriate coolant is used, the cooling system is not sufficiently
protected against overheating and corrosion at high outside tempera‐
tures.
#
Only use coolant approved for Mercedes-Benz.
#
Observe the instructions in the Mercedes-Benz Specifications
for Operating Fluids 320.1.
Have the coolant regularly replaced at a qualified specialist workshop.
PROPORTION OF ANTIFREEZE CONCENTRATE IN THE ENGINE COOLING
SYSTEM:
R
A minimum of 50% (antifreeze protection down to about -37°C)
R
A maximum of 55% (antifreeze protection down to -45°C)
Notes on windscreen washer fluid
Observe the notes on operating fluids (/page705).
&
WARNING
Risk of fire and injury from windscreen washer concentrate
Windscreen washer concentrate is highly flammable. If it comes into
contact with hot components, it may ignite.
#
Make sure that windscreen washer concentrate is not spilled
near to the filler opening.
*
NOTE
Damage to the exterior lighting due to unsuitable windscreen
washer fluid
Unsuitable windscreen washer fluids may damage the plastic surface of
the exterior lighting.
#
Only use windscreen washer fluids which are also suitable for
use on plastic surfaces, e.g. MB SummerFit or MB WinterFit.
*
NOTE
Blocked spray nozzles caused by mixing windscreen washer fluids
#
Do not mix MB SummerFit and MB WinterFit with other wind‐
screen washer fluids.
Do not use distilled or de-ionised water. Otherwise, the fill level sensor may be
triggered erroneously.
RECOMMENDED WINDSCREEN WASHER FLUID:
R
above freezing point: e.g. MB SummerFit
R
below freezing point: e.g. MB WinterFit
For the correct mixing ratio, refer to the information on the antifreeze con‐
tainer.
Mix washer fluid with windscreen washer fluid all year round.
G-Class - Owner's Manual
Technical data Operating fluids
F465 0034 02

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