Coolants - Mercedes-Benz 300 SE 1989 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. - 3 0 °C
( — 22 °F) and corrosion protection.
The red area of the tem perature
gauge is m atched to the heating pro­
perties of this coolant solution.
The coolant solution m ust 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 im portant corrosion
protection, the solution m ust be at
least 40 % anticorrosion/antifreeze
(equals a freeze protection to approx.
- 2 5 °C [ — 13 °F ]). If you use a solu­
tion that is more than 55 °/o a nticorro­
sion/antifreeze (freeze protection to
approx. — 45 °C [ - 4 9 °F ]), the
engine tem perature will increase due
to the lower heat transfer capability of
the solution. Therefore, do not use
more than this am ount of antico rro­
sion/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
fo r signs o f leakage).
The w ater in the cooling system m ust
meet minimum requirem ents, which
are usually satisfied by normal drin k­
ing water. If you are not sure about
the w ater quality, consult your author­
ized MERCEDES-BENZ dealer.
A nticorrosion/antifreeze
Your vehicle contains a num ber of
aluminium parts. The use of alumi­
nium com ponents in m otor vehicle
engines necessitates that anticorro­
sion/antifreeze coolant used in such
engines be specifically form ulated to
protect the aluminium parts.
(Failure to use such a nticorrosion/
antifreeze coolant will result in a sig­
nificantly shortened service life.)
Therefore the following product is
strongly recom m ended fo r use in
your car: MERCEDES-BENZ A nticor­
rosion/A ntifreeze Agent.
Before the start of the w inter 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 fo r mainte­
nance service.
A pprox. freeze
A n ticorrosion/
protection antifreeze
- 3 0 °C
4.50 I (4.8 US qt)
- 2 2 °F)
- 4 5 °C
5.50 1(5.8 US qt)
- 4 9 °F)
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