Mercedes-Benz 240 D 1978, Owner'S Manual

Page: 86 / 91

Fuels C oolants Lubricants etc.
Coolants
The coolant is a m ixture o f w ater
and antifreeze. In the w orks the
coolant is blended w ith antifreeze
o ffering protection to approx.
- 2 2 ° F ( - 3 0 ° C). The coolant
tem perature gauge in the instru ­
m ent cluster is m atched w ith it and
corrosion inhibition in the cooling
system is ensured at the same
time.
The coolant remains in the cooling
system all year round and m ust be
renewed after 2 years at the latest.
This applies also to trailer opera­
tion, hard driving and to vehicles
driven in tropical countries.
If coolant has leaked from the c o o l­
ing system, replace the missing
q ua ntity w ith w ater and a recom ­
mended brand o f antifreeze.
For norm al replenishm ent (due to
evaporation o f w ater) plain w ater
w ill do.
The w ater should be clean, and
s o ft to m oderately soft. It should
also contain the least possible
proportion o f dissolved materials
(potable w ater quality).
Antifreeze in the coolant should
ensure m inim um protection to
- 4 ° F ( - 2 0 ° C).
If no antifreeze is available, add a
treating agent to the cooling w ater
(for corrosion inhibition in the
cooling system). To treat the c o o l­
ing w ater, do n o t use more than
1 % (10 cu .cm /l) o f a recom ­
mended treating agent.
W ith o u t antifreeze the coolant
already starts boiling at approx.
244° F (118° C).
A n tifre e z e
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 u t only at
each MERCEDES-BENZ m ain­
tenance service.
To prevent damage to the cooling
system, fill only w ith recom ­
mended brands o f antifreeze.
A n y MERCEDES-BENZ service
station w ill readily advise you on
recom m ended antifreeze brands.
300 D
240 D 300 CD
Protection Antifreeze
up to U S /Im p . qts. (liter)
- 4 ° F 3.7/3.1 3.7/3.3
- 2 0 ° C)
(3.5 I) (3.75 I)
- 2 2 ° F 4.7/3.9
5.3/4.4
- 3 0 ° C) (4.5 I)
(5.0 I)
- 4 0 ° F 5.5/4.6 6/5.1
- 4 0 ° C)
(5.25 I)
(5.75 I)