Cooling System 43
Antifreeze or premixed coolant meeting the
standards ASTM D 3306 or ASTM D 4656
are primarily for automotive gasoline en-
gines, containing high levels of silicate, and
are unacceptable for heavy duty diesel en-
gines
.
Recommended antifreeze meeting the
ASTM D 4985 standard is a low silicate
ethylene glycol based antifreeze for heavy
duty diesel engines. Standard antifreeze re-
quires an initial charge of supplement
coolant additives (SCA) when filling new
coolant. Extended life antifreeze does not
need an initial charge.
NOTE! ASTM D 4985 requires the use of
SCA to be added to the coolant to bring it
up to the recommended SCA level when
the coolant is initially filled or replaced.
Water and antifreeze should generally be
filled as a 50/50 mixture. The mixture
should never be less than 40% antifreeze
and 60% clean water or more than 60% an-
tifreeze and 40% clean water. Mix the
antifreeze/water to the required concentra-
tion before adding to the cooling system.
The following table gives approximate
freezing protection for certain mixtures.
Freeze Protection
Down To:
Percentage of An-
tifreeze in Mixture
-13
F (-25
C) 40%
-22
F (-30
C) 46%
-36
F (-38
C) 54%
-51
F (-46
C) 60%
NOTE! 60% antifreeze in the mixture gives
maximal freeze protection. To increase the
antifreeze content beyond that will only de-
crease the freeze protection.
W2003082
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