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GENERAL
12
SUPPLEMENTAL COOLANT ADDITIVE MAINTENANCE GUIDE
Use supplemental coolant additives (corrosion inhibitors) to protect the engine cooling system from corrosion. Antifreeze
alone does not provide enough corrosion protection for a heavy duty diesel engine. Supplemental corrosion protection must
be supplied through periodic additions of supplemental coolant additives to the coolant.
To protect against corrosion, a new coolant charge must be brought up to 0.26 DCA4 unit per liter (one unit per U.S. gal) of
coolant (initial charge). Maintain the correct DCA4 concentration by changing the service coolant filter at each engine oil and
filter change interval.
Each time the coolant is drained and replaced, the coolant must be recharged with supplemental coolant additives. Use the
appropriate DCA4 spin-on filter listed in following table. The coolant mixture must be drained and replaced as defined under
"General".
The amount of replacement inhibitor is determined by the length of the service interval and the cooling system capacity. Refer
to the DCA4 Unit Guide for the selection of the correct filter to replenish the DCA4.
If coolant is added between drain intervals, additional DCA4 will be required. Check the coolant DCA4 concentration level
anytime make-up coolant is added to the system. The DCA4 concentration must not fall below 0.13 units per liter or exceed
0.5 units per liter (0.5 units per U.S. gallon or exceed 2 units per U.S. gallon).
Fleet guard Part No.
DCA4 Coolant Filter
WF-2070
WF-2071
WF-2072
WF-2073
WF-2074
WF-2075
WF-2076
WF-2077
DCA4 Liquid
DCA60L
DCA80L
DCA4 Powder
01-10
DCA4 Unit Guide
DCA95
FUEL, COOLANT, AND LUBRICANTS
DCA4 Units
2
4
6
8
12
15
23
0
4 (1 Pint)
1760 (55 US gal)
20
GD530/650/670
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