Coolants - Mercedes-Benz 300 CD 1978 Owner's Manual

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
offering protection to approx.
- 2 2 ° F ( - 3 0 ° C). The coolant
tem perature gauge in the instru­
ment 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 co ol­
ing system, replace the missing
q uantity 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, 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 co ol­
ing w ater, do n ot 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 eze
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.
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
recomm 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 5.3/4.4
4.7/3.9
- 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)