ENGINE MAINTENANCE - Cooling System Maintenance Engine Oil and Filter Change Intervals 2 km) for severe duty, or every six months. Cooling System Maintenance NOTE If B6-B20 biodiesel fuel is used, the oil and filter must be changed every 40,000 mi (64,000 km) for line haul ap- plications; every 20,000 mi (32,000 Information about concentration and condition of coolant, including filter.
42 Y53-1166-1G1 (08/2018) Vehicle Application Change Interval Oil Drain and Filter Replacement Interval Normal Duty (Line Haul) - less than 20% idle time 75,000 miles (120,000 km) 2,250 hours or 12 months Normal Duty (Line Haul) - more than 20% idle time 50,000 miles (80,000 km) 1,500 hours or 12 months Severe Duty (Vocational*) 30,000 miles (48,000 km) 800 hours, or 12 months * Vocational vehicle applications include: Agriculture, Concrete Mixers, Construction, Crane, Dumps, Emergency/Fire, Heavy Equipment, Loggers, Mining, Oil Field, Refuse, Pick-up & Delivery, Snowplows, and Wrecker.