Coolants - Mercedes-Benz 190 E 2.3 1991 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 corro­
sion protection and freeze protection
to approx. - 3 0 °C ( - 2 2 °F).
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 pro­
tection, the solution must be at least
40% anticorrosion/antifreeze (equals a
freeze protection to approx. - 2 5 °C
[- 1 3 °F[). If you use a solution that is
more than 55% anticorrosion/anti­
freeze (freeze protection to approx.
- 4 5 °C [— 49 °F]), the engine tempera­
ture will increase due to the lower heat
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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 wa­
ter quality, consult your authorized
MERCEDES-BENZ dealer.
Anticorrosion/antifreeze
Your vehicle contains a number of alu­
minum parts. The use of aluminum
components in motor vehicle engines
necessitates that anticorrosion/anti­
freeze coolant used in such engines be
specifically formulated to protect the
aluminum parts. (Failure to use such
anticorrosion/antifreeze coolant will re­
sult in a significantly shortened service
life.)
Therefore the following product is
strongly recommended for use in your
car: MERCEDES-BENZ Anticorrosion/
Antifreeze Agent.
Before the start of the winter season
(or once a year in the hot southern re­
gions), you should have the anti­
corrosion/antifreeze concentration
checked. The coolant is also regularly
checked each time you bring your ve­
hicle to your authorized MERCEDES-
BENZ dealer for maintenance service.
Approx. freeze Anticorrosion/
protection
antifreeze
- 3 7 °C
4.50 I (4.8 US qt)
(-3 5 °F)
- 4 5 °C
5.25 I (5.5 US qt)
(— 49°F)