13.3 Fuel, Oil and Coolant Specifications
DETROIT DIESEL 53
Inhibitor depletion will occur in ethylene glycol base
antifreeze through normal service. The inhibitors
should be replenished at approximately 500 hour or
20,000 mile intervals with a nonchromate inhibitor
system. Commercially available inhibitor systems such
as Nalcool 2000 may be used to reinhibit antifreeze
Several brands of permanent antifreeze are available
with sealer additives. The specific type of sealers vary
with the manufacturer. Antifreeze with sealer additives
is not recommended for use in Detroit Diesel engines
due to plugging problems throughout various areas of
the cooling system.
Always use a properly inhibited coolant.
If freeze protection is required, always use
ethylene glycol antifreeze.
Re-inhibit antifreeze with a non-chromate in-
Always follow the manufacturer's recommend-
ations on inhibitor usage and handling.
Do not use soluble oil.
Chromate inhibitors should never be used with
Scaler type antifreeze should not be used. 8.
Maintain prescribed inhibitor strength.
1972 General Motors Corp.