Notes - Mercedes-Benz G-Class Operator's Manual

Service products and filling capacities
294
Coolant
Important safety notes
G
WARNING
If antifreeze comes into contact with hot com-
ponents in the engine compartment, it may
ignite. There is a risk of fire and injury.
Let the engine cool down before you add anti-
freeze. Make sure that antifreeze is not spilled
next to the filler neck. Thoroughly clean the
antifreeze from components before starting
the engine.
!
Only add coolant that has been premixed
with the desired antifreeze protection. You
could otherwise damage the engine.
Further information on coolants can be found
in the Mercedes-Benz Specifications for Ser-
vice Products, MB BeVo 310.1, e.g. on the
Internet at http://bevo.mercedes-benz.com.
Or contact a qualified specialist workshop.
!
Always use a suitable coolant mixture, even
in countries where high temperatures prevail.
Otherwise, the engine cooling system is not
sufficiently protected from corrosion and
overheating.
i
Have the coolant regularly replaced at a
qualified specialist workshop and the replace-
ment confirmed in the Maintenance Booklet.
Comply with the important safety precautions
for service products when handling coolant
( page 289).
Y
The coolant is a mixture of water and anti-
freeze/corrosion inhibitor. It performs the fol-
lowing tasks:
corrosion protection
R
antifreeze protection
R
raising the boiling point
R
If the coolant has antifreeze protection down to
-35 ‡ (-37 †), the boiling point of the coolant in
the pressurized system is approximately 266 ‡
(130 †).
The antifreeze/corrosion inhibitor concentra-
tion in the engine cooling system should:
be at least 50%. This will protect the engine
R
cooling system against freezing down to
approximately -35 ‡ (-37 †).
not exceed 55% (antifreeze protection down
R
to -49 ‡ [-45 †]). Otherwise, heat will not be
dissipated as effectively.
Mercedes-Benz recommends an antifreeze/
corrosion inhibitor in accordance with MB Spec-
ifications for Service Products 310.1.
i
When the vehicle is first delivered, it is filled
with a coolant mixture that ensures adequate
antifreeze and corrosion protection.
i
The coolant is checked with every mainte-
nance interval at a qualified specialist work-
shop.
The engine cooling system is filled with coolant
at the factory which contains antifreeze/corro-
sion inhibitor that ensures protection down to
approximately -35 ‡ (-37 †).
Your vehicle has a range of aluminum compo-
nents. Aluminum components in the engine
make it necessary to use antifreeze/corrosion
inhibitor that has been specifically formulated to
protect the aluminum parts. Failure to use such
anticorrosion/antifreeze coolant will result in a
significantly shortened service life.
The coolant must be used throughout the year in
order to maintain the necessary corrosion pro-
tection and to provide protection from over-
heating. In the Maintenance Booklet, you can
find information on the intervals for renewal.
The renewal interval is determined by the cool-
ant type and the engine cooling system design.
The renewal interval in the Maintenance Booklet
is only valid if the coolant is renewed or added to
with Mercedes-Benz approved products. There-
fore, only use MB 326.0 antifreeze/corrosion
inhibitor or another Mercedes-Benz approved
product of the same specification.
Information on other products with the same
specifications that are approved by Mercedes-
Benz can be obtained at an authorized
Mercedes-Benz Center or on the Internet at
http://bevo.mercedes-benz.com.
If the coolant level is too low, MB 325.0 anti-
freeze/corrosion inhibitor should be added.
Have the engine cooling system checked for
possible leaks.