GMC 2003 C4C042 Owner's Manual page 360

90,000 Miles (144 000 km) (Continued)
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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)
97,500 Miles (156 000 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)
7-14
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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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Wheels and tires service. (15)
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Parking brake service (or every 6 months, whichever
occurs first). (8)
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L18/LB7 Engines Only: Clutch pedal free
travel service. (10)
100,000 Miles (160 000 km)
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DURAMAX
oil and filter (or every 12 months, whichever
occurs first). (2)(3)
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Diesel Only: Inspect engine drive belt; replace
as necessary.
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Gasoline Engine Only (Vehicles with GVW of
16,000 lbs. or less): Spark plug service. (3)(28)
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Change power steering fluid (or every 36 months,
whichever occurs first). (13)
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Replace power steering reservoir filter element
(or every 24 months, whichever occurs first).
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Front axle service. (38)
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Rear axle service
(or every 12 months, whichever occurs first). (37)
Diesel Only: Change engine
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Eaton, Rockwell, Spicer Axles