Mercedes-Benz G-Class Owner's Manual page 410

Technical data
Service products and capacities
Coolant is a mixture of water and anti-
freeze and corrosion inhibitor. It performs
the following tasks in the cooling system:
Anti-corrosion protection
Antifreeze protection
Raising the boiling point
!
Always use a suitable coolant – even in
countries with high temperatures.
If you do not do so, the cooling system
will not be sufficiently protected from
corrosion and the boiling point will be
too low.
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If antifreeze/corrosion inhibitor is present
in the correct concentration, the boiling
point of the coolant will be around 130 °C.
The antifreeze and corrosion inhibitor con-
centration in the cooling system should be
around 50%. This will protect the cooling
system against freezing down to around
–37 °C.
The antifreeze and corrosion inhibitor con-
centration in the cooling system should
not exceed 55% (antifreeze protection
down to –45 °C), since the heat is then not
removed so effectively.
Nur fuer internen Gebrauch
If the vehicle is losing coolant:
Top it up with equal parts of water and
an antifreeze and corrosion inhibitor.
Mercedes-Benz recommends anti-
freeze and corrosion inhibitor that have
been approved by Mercedes-Benz.
!
Have the coolant renewed every
15 years or after 250,000 km have
been covered.