GMC 2003 C4C042 Owner's Manual page 359

90,000 Miles (144 000 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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DURAMAX Diesel Only: Change engine
oil and filter (or every 12 months, whichever
occurs first). (2)(3)
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Check fluid levels (or every 3 months, whichever
occurs first). (1)(6)
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DURAMAX Diesel Only: Replace fuel filter.
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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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Replace fuel filter(s) (or every 12 months, whichever
occurs first). (3)
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Steering system service. (13)
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Front and rear suspension service. (14)
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- - -
Spring to axle U bolts and shackle
bolts service. (16)
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Exhaust system service (or every 6 months,
whichever occurs first). (3)(4)(17)
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Inspect door hinge pins and bushings and replace
as necessary.
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Wheels and tires service. (15)
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Hydraulic brake service (or every 6 months,
whichever occurs first). (7)(46)
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Parking brake service (or every 6 months, whichever
occurs first). (8)
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C600, C700 and C800 Gasoline Engines Only:
Engine drive belts service (or every 12 months,
whichever occurs first). (18)
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Thermostatically controlled engine cooling fan
service. (4)(20)
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Shields and underhood insulation service. (4)(5)(21)
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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)
(Continued)
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