Table 9.
Coolant
Interval
Action
Ethylene Glycol* / Water +
Conventional Corrosion Inhibitor
20,000 miles (32,000 km)
or 3 months
Test nitrite concentration
with test strip. Add SCA
or dilute coolant as
needed.
300,000 miles (480,000
km)
Drain and clean system.
Refill with new coolant.
Ethylene Glycol* / Water + OAT
Inhibitor
300,000 miles (48,000
km) or 10,000 hours
Add POWERCOOL Plus
extender.
600,000 miles (960,000
km), 4–years, or Engine
Overhaul
Drain and clean system.
Refill with new coolant.
Ethylene Glycol* / Water + NOAT
Inhibitor
300,000 miles (48,000
km) or 10,000 hours
Add NOAT extender.
600,000 miles (960,000
km), 4–years, or Engine
Overhaul
Drain and clean system.
Refill with new coolant.
Water Only + Conventional Corrosion
Inhibitor
20,000 miles (32,000
km), 3–months, or 500
hours
Test nitrite concentration
with test strip. Add SCA
or dilute coolant as
needed.
Engine Overhaul
Drain and clean system.
Refill with new coolant.
Water Only + OAT Inhibitor
300,000 miles (480,000
km), 2–years, or 10,000
hours
Add POWERCOOL Plus
extender.
600,000 miles (960,000
km), 4–years, or Engine
Overhaul
Drain and clean system.
Refill with new coolant.
Water Only + NOAT Inhibitor
300,000 miles (480,000
km), 2–years, or 10,000
hours
Add NOAT extender.
600,000 miles (960,000
km), 4–years, or Engine
Overhaul
Drain and clean system.
Refill with new coolant.
*Propylene glycol is an acceptable substitute for ethylene glycol.
How to Procedures
96
All information subject to change without notice.
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