Coolants - Mercedes-Benz 350 SDL Owner'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 approx. -30°C (-22°F)
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 40 % anticorrosion/antifreeze
(equals a freeze protection to approx.
-25°C [-13°F]). If you use a solu­
tion that is more than 55 % anticorro­
sion/antifreeze (freeze protection to
104
approx. -45°C [-49°F]), 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 Anticor­
rosion/Antifreeze Agent.
Before the start of the winter season
(or once a year in the hot southern
regions), you should have the anticor­
rosion/antifreeze concentration
checked. The coolant is also regularly
checked each time you bring your
vehicle to your authorized
MERCEDES-BENZ dealer for mainte­
nance service.
Approx. freeze Anticorrosion/
protection antifreeze
4.50 I (4.8 US qt)
5.50 I (5.8 US qt)