SERIES 60 ON-HIGHWAY ENGINE OPERATOR'S GUIDE 1 Maintenance interval based on application. Drain interval dependent on proper maintenance. Table 21 Coolant Maintenance Intervals Nitrite levels must be within the ranges listed in Table 17. All information subject to change without notice. 99 DDC-SVC-MAN-0039 Copyright © 2009 DETROIT DIESEL CORPORATION Coolant Interval 1 Action Antifreeze / Water + SCA Inhibitor (DDC Power Cool) 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 + SCA Inhibitor or Propylene Glycol / Water + SCA 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 or Propylene Glycol / Water + OAT Inhibitor Test at 1 Year. — 300,000 Miles (480,000 km) or 2 Years* Add Power Cool Plus Extender 600,000 Miles (960,000 km) Drain and clean system. Replace with new coolant. Water Only + SCA 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. Replace with new coolant. Water Only + OAT Coolant 300,000 Miles (480,000 km) or 2 Years* Add Power Cool Plus Extender 600,000 Miles (960,000 km) Clean and drain. Replace with new coolant.