G-Class Owner's Manual - Mercedes G-Class, G-Wagon, G500, G55 ...

Technical data
Service products and capacities
Coolant is a mixture of water and antifreeze
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.
410
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 concentration
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 concentration
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 antifreeze
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.