Coolants - Mercedes-Benz 240 D 1980 Owner's Manual

Coolants

The coolant is a m ixture o f w ater
and antifreeze. In production, the
cooling system is filled w ith an anti-
freeze-water m ixture o ffering pro­
tection to approx. —30° C /—22° F.
The red mark on the tem perature
gauge in the instrum ent cluster is
matched to this antifreeze-water
m ixture (approx. boiling point
125° C/2570 F). The protection
against corrosion is also ensured
by this m ixture m aking it unnec­
essary to add a corrosion
inhibitor.
The coolant remains in the cooling
system all year round and m ust be
renewed after years at the latest.
2
If coolant has leaked from the co ol­
ing system, replace the missing
quantity w ith w ater and a recom ­
mended brand o f antifreeze.
For normal replenishment (due to
evaporation o f water) plain w ater
w ill do.
The w ater should be clean, so ft to
medium soft and contain a m ini­
mum am ount o f scale form ing
minerals (potable w ater quality).
The coolant m ixture should always
contain enough antifreeze to en­
sure protection to a m inim um o f
- 2 0 ° C / —4° F.
If antifreeze is not available, add a
corrosion inhibitor to the cooling
w ater to ensure proper protection
against corrosion. To treat the co ol­
ing w ater, do not use more than
% cm /l) o f a recomm ended
1 (10 3
corrosion inhibitor.
W ith o u t antifreeze in the cooling
system, the w ater already starts
boiling at approx. 118° C/224° F,
w hich means th a t the pointer o f
the tem perature gauge in the
instrum ent cluster may still be
below the red mark.
A n tifre e ze
Your vehicle contains a num ber o f
alum inum parts. The use o f alu­
m inum com ponents in m otor
vehicle engines necessitates that
antifreeze/coolant used in such
engines be specifically form ulated
to protect the alum inum parts.
(Failure to use such antifreeze/
coolant may result in a sign ifican t­
ly shortened service life.)
Fuels C oolants Lubricants etc.
W hile there may be a num ber o f
antifreeze/coolants available which
w ill provide the requisite protec­
tion, all such products have not
been tested fo r MERCEDES-BENZ
vehicles. The fo llo w in g products,
however, are deemed suitable for
use in your car: MERCEDES-BENZ
Anti-Freeze and Sum m er Coolant.
Prior to the onset o f the cold
season, check the coolant fo r its
resistance to cold. Repeat this
check during the cold spell.
Regular testing o f the antifreeze
concentration is carried o ut only at
each MERCEDES-BENZ m ain­
tenance service.
300 D
240 D 300 CD
Protection Antifreeze
up to liter/U S qt
- 2 0 ° C 3.5 I
3.75 I
- 4° F 3.7 US qt
3.7 US qt
- 3 0 ° C 4.5 I 5.0 I
- 2 2 ° F 4.7 US qt 5.3 US qt
- 4 0 ° C 5.25 I 5.75 I
- 4 0 ° F 5.5 US qt
6
US qt