Figure 4. Coolant Freezing and Boiling Temperatures vs. Antifreeze Concentration (Sea Level)
Several brands of permanent antifreeze are available with sealer additives. The specific type of sealer varies
with the manufacturer. Antifreeze with sealer additives is NOT RECOMMENDED for use in Detroit Diesel
engines due to possible plugging throughout various areas of the cooling system.
All Detroit Diesel engines incorporate pressurized cooling systems which normally operate at temperatures
higher than nonpressurized systems. It is essential that these systems be kept clean and leak-free, that filler
caps and pressure relief mechanisms be correctly installed at all times, and that coolant levels be properly
Use extreme care when removing a coolant pressure control cap from an engine.
The sudden release of pressure from a heated cooling system can result in a loss
of coolant and possible personal injury (scalding) from the hot liquid.
Always use a properly inhibited coolant.
Do not use soluble oil.
Maintain the prescribed inhibitor strength.
Always follow the manufacturer's recommendations on inhibitor usage and handling.
If freeze protection is required, always use a permanent-type antifreeze.
Reinhibit antifreeze with a recommended nonchromate inhibitor system.
Do not use a chromate inhibitor with permanent-type antifreeze.
Do not use methoxy propanol base antifreeze in Detroit Diesel engines.