Coolants - Mercedes-Benz Light Truck ML 320 Operator's Manual

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 -22°F
(-30°C) and corrosion protection.
The coolant solution must be used year
round to provide the necessary
corrosion protection and increase in the
boil-over protection. You should have
it replaced every 3 years.
To provide the important corrosion
protection, the solution must be at least
45% anticorrosion/antifreeze (equals a
freeze protection to approx. -22°F
|-30°C]). If you use a solution that is
more than 55% anticorrosion/antifreeze
(freeze protection to approx. -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
anticorrosion/ antifreeze.
If the coolant level is low, water and
MB anticorrosion/antifreeze should be
used to bring it up to the proper level
(have cooling system checked for signs
of leakage).
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, consult your authorized
Mercedes-Benz dealer.
Anticorrosion/antifreeze
Your vehicle contains a number of
aluminum parts. The use of aluminum
components in motor vehicle engines
necessitates that anticorrosion/
antifreeze coolant used in such engines
be specifically formulated to protect
the aluminum parts. (Failure to use
such anticorrosion/ antifreeze coolant
will result in a significantly shortened
service life.)
Therefore the following product is
strongly recommended for use in your
car: Mercedes-Benz Anti corrosion/
Antifreeze Agent.
Before the start of the winter season
(or once a year in the hot southern
regions), you should have the
anticorrosion/antifreeze concentration
checked. The coolant is also regularly
checked each time you bring your
vehicle to your authorized Mercedes-
Benz dealer for service.
Anticorrosion/antifreeze quantity
Approx. freeze protection
-35 °F -49 °F
(-37 °C) (-45 °C)
6.3 US qt 7.0 US qt
(6.0 l) (6.6 l)
146