Fuel, Oil and Coolant Specifications
DETROIT DIESEL
2. If freeze protection is required, always use ethylene
If deposits are present, the cooling system must be
glycol antifreeze.
chemically cleaned with a commercial grade heavy-duty
de-scaler.
3. Re-inhibit antifreeze with a non-chromate inhibitor
system.
Inhibitor depletion will occur in ethylene glycol base
antifreeze through normal service. The inhibitors should
4. Always follow the manufacturer's recommendations
be replenished at approximately 500 hour or 20,000 mile
on inhibitor usage and handling.
intervals with a non-chromate inhibitor system.
Commercially available inhibitor systems (Fig. 2) may
5. Do not use soluble oil.
be used to re-inhibit antifreeze solutions.
6. Chromate inhibitors should never be used with
Several brands of permanent antifreeze are available
permanent antifreeze.
with sealer additives. The specific type of sealers vary
with the manufacturer. Antifreeze with sealer additives
7. Sealer type antifreeze should not be used.
is not recommended for use in Detroit Diesel engines
due to plugging problems throughout various areas of
8. Maintain prescribed inhibitor strength.
the cooling system.
9. Do not mix ethylene glycol base antifreeze with
COOLANT RECOMMENDATIONS
methoxy propanol base antifreeze in the cooling system.
1. Always use a properly inhibited coolant.
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