GMC 2003 C4C042 Owner's Manual page 357

67,500 Miles (108 000 km)
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Gasoline Engine Only: Check Oil Life System.
If engine oil and filter are changed, reset system.
See "Engine Oil" in the Index. (3)(9)
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Check fluid levels (or every 3 months, whichever
occurs first). (1)(6)
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Chassis lubrication service (or every 6 months,
whichever occurs first). (12)
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Cooling system service. Clean the cooling system
filler cap with clean water, clean the core, pressure
test the cap and the system for proper pressure
capability and inspect condition of cooling and
heater hoses and clamps. Replace hoses if cracked,
swollen or damaged.
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Wheel bearing (grease type) service (or every
24 months, whichever occurs first, and whenever
hubs are removed). (23)(46)
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Wheels and tires service. (15)
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Parking brake service (or every 6 months, whichever
occurs first). (8)
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Rear axle air shift motor service. (11)
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Air intake system service (or every 24 months,
whichever occurs first). (4)(5)(24)
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Evaporative Control System service (if equipped) (or
every 24 months, whichever occurs first). (3)(26)
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Air brake service (or every 6 months, whichever
occurs first). (39)
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Air brake automatic slack adjuster service (or every
500 hours, whichever occurs first). (40)
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Check air brake relay valve operation and check
for leaks (or every month, or every 300 hours,
whichever occurs first).
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Clean air brake application valve (or every 3 months,
or every 300 hours, whichever occurs first); lubricate
linkage.
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Air brake chamber service (or every 2 months,
whichever occurs first). (41)
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Trailer brake hand control valve service
(or every 3 months, or every 900 hours,
whichever occurs first). (42)
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L18/LB7 Engines Only: Clutch pedal free
travel service. (10)
70,000 Miles (112 000 km)
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DURAMAX Diesel Only: Change engine
oil and filter (or every 12 months, whichever
occurs first). (2)(3)
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