Specifications

Engine Cooling System Preventive Maintenance
– 178 – Y53-6008A
Medium Duty (R05/09)
Use a solution of half ethylene glycol antifreeze and half
water for best heater performance. Do not use more than 65
percent concentration of antifreeze, as a shortened heater
life will result.
After servicing the cooling system, operate the vehicle for a
day or two before using the heater. Trapped air inside the
engine needs time to escape.
PREVENTIVE MAINTENANCE (PM) INTERVALS
I
AB C D E
At the first 15,000 mi./
24,000 km or at the first
PM
15,000 mi./24,000 km/
Monthly
30,000 mi./48,000 km 60,000 mi./96,000 km/
6 months
120,000 mi./
192,000km / Annually
240,000 mi./384,000 km
SYSTEM COMPONENT MAINTENANCE TASK
Recommended
PM Interval
I ABCDE