Mercedes-Benz SLK 230 KOMPRESSOR 1999, Owner'S Manual

Page: 138 / 153

Coolants
The engine coolant is a m ixture of
w ater and anticorrosion/antifreeze,
which provides:
• corrosion protection,
• freeze protection,
• boiling protection (by increasing
the boiling point).
The cooling system w as filled at
the factory with a coolant providing
freeze protection to approxim ately
- 2 2 ° F (-3 0 °C ) and corrosion
protection.
The coolant solution m ust be used
year round to provide the neces­
sary corrosion protection and in­
crease in the boil-over protection.
You should have it replaced every
3 years.
To provide the im portant corrosion
protection, the solution m ust be at
least 45% anticorrosion/antifreeze
(equals a freeze protection to
approx. -2 2 ° F [-3 0 °C ]). If you use
a solution that is more than 55%
anticorrosion/antifreeze (freeze
protection to approx. -4 9 ° F
[-45 °C ]), the engine tem perature
will increase due to the low er heat
transfer capability of the solution.
Therefore, do not use m ore than
this am ount of anticorrosion/
antifreeze.
If the coolant level is low, w ater
and MB anticorrosion/antifreeze
should be used to bring it up to the
proper level (have cooling system
checked for signs of leakage).
T he w ater in the cooling system
m ust m eet m inim um requirem ents,
which are usually satisfied by
norm al drinking water. If you are
not sure about the w ater quality,
consult your authorized M ercedes-
Benz dealer.
Anticorrosion/antifreeze
Y our vehicle contains a num ber of
alum inum parts. The use of alum i­
num com ponents in m otor vehicle
engines necessitates that anticor­
rosion/antifreeze coolant used in
such engines be specifically form u­
lated to protect the alum inum parts.
(Failure to use such anticorrosion/
antifreeze coolant will result in a
significantly shortened service life.)
Therefore the follow ing product is
strongly recom m ended for use in
your car: M ercedes-Benz A n ti­
corrosion/A ntifreeze Agent.
Before the start of the w inter
season (or once a year in the hot
southern regions), you should have
the anticorrosion/antifreeze co n ­
centration checked. The coolant is
also regularly checked each tim e
you bring your vehicle to your
authorized M ercedes-Benz dealer
for service.
Anticorrosion/antifreeze quantity
Approx. freeze protection
-3 5 ° F -4 9 ° F
(-3 7 °C ) (—45°C)
4.0 US qt 4.8 US qt
(3.7 I) (4.6 I)
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