Coolants - Mercedes-Benz 300TD 1980 Owner's Manual

Fuels

Coolants

Lubricants etc.
Coolants .
The coolant is a mixture of water and
antifreeze. In production, the cooling
system is filled with an antifreeze-
water mixture offering protection to
approx. -30° C /-22° F. The red mark
on the temperature gauge in the
instrument cluster is matched to this
antifreeze-water mixture (approx.
boiling point 125° C/2570 F). The pro­
tection against corrosion is also en­
sured by this mixture making it un­
necessary to add a corrosion inhibi­
tor.
The coolant remains in the cooling
system all year round and must be
renewed after 2 years at the latest.
If coolant has leaked from the cooling
system, replace the missing quantity
with water and a recommended
brand of antifreeze. For normal
replenishment (due to evaporation of
water) plain water will do.
The water should be clean, soft to
medium soft and contain a mini­
mum amount of scale forming
minerals (potable water quality).
The coolant mixture should always
contain enough antifreeze to ensure
protection to a minimum of -20° C/
-4° F.
If antifreeze is not available, add a
corrosion inhibitor to the cooling
water to ensure proper protection
against corrosion. To treat the cool­
ing water, do not use more than 1 %
(10 cm 3/l) of a recommended corro­
sion inhibitor.
Without antifreeze in the cooling
system, the water already starts boil­
ing at approx. 118° C/224° F, which
means that the pointer of the tem per­
ature gauge in the instrument cluster
may still be below the red mark.
Antifreeze
Your vehicle contains a number of
aluminum parts. The use of alu­
minum components in motor vehicle
engines necessitates that antifreeze/
coolant used in such engines be
specifically formulated to protect the
aluminum parts. (Failure to use such
antifreeze/coolant may result in a
significantly shortened service life.)
While there may be a number of anti­
freeze/coolants available which will
provide the requisite protection, all
such products have not been tested
for MERCEDES-BENZ vehicles.
The following products, however, are
deemed suitable for use in your car:
MERCEDES-BENZ Anti-Freeze and
Summer Coolant.
Prior to the onset of the cold season,
check the coolant for its resistance to
cold. Repeat this check during the
cold spell. Regular testing of the
antifreeze concentration is carried
out only at each MERCEDES-BENZ
maintenance service.
Protection
up to Antifreeze
-20° C 3.75 I
- 4°F
3.7 US qt
-30° C 5.0 I
-22° F 5.3 US qt
-40° C
5.75 I
-40° F 6 US qt