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Frequent Low-speed Operation, Consistent Heavy Traffic Under 25 mph (40 km/h) or Long Rush-hour Traffic Change the engine oil and filter as indicated by the As required Replace the engine-mounted and frame-mounted fuel Every 15,000 mi Flush and refill the coolant. Every 60,000 mi Note: After the initial coolant flush and fill at 60,000 mi (96,000 km) or 2400 engine hours, flush and fill every 45,000 mi (72,000 km) or 1800 engine hours thereafter. Sustained High-speed Driving at Gross Vehicle Weight Rating (Maximum Loaded Weight for Vehicle Operation) Change the engine oil and filter as indicated by the As required Replace the engine-mounted and frame-mounted fuel Every 15,000 mi Replace the wheel bearing grease and grease seals if using Every 30,000 mi Flush and refill the coolant. Every 60,000 mi Note: After the initial coolant flush and fill at 60,000 mi (96,000 km) or 2400 engine hours, flush and fill every 45,000 mi (72,000 km) or 1800 engine hours thereafter. 632 Scheduled Maintenance |