GMC 2003 C4C042 Owner's Manual page 358

75,000 Miles (120 000 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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Chassis lubrication service (or every 6 months,
whichever occurs first). (12)
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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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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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Wheels and tires service. (15)
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Fuel tank, fuel cap and fuel lines service (or every
72 months, whichever occurs first). (3)(30)
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EGR system inspection (or every 72 months,
whichever occurs first). (3)(31)
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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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Thermostatically controlled engine cooling
fan service. (4)(20)
7-12
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Shields and underhood insulation service. (4)(5)(21)
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L18/LB7 Engines Only: Clutch pedal free
travel service. (10)
80,000 Miles (128 000 km)
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DURAMAX
oil and filter (or every 12 months, whichever
occurs first). (2)(3)
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Air compressor dry element pleated paper air strainer
service (or every 2 months or every 800 hours,
whichever occurs first).
82,500 Miles (132 000 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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Wheels and tires service. (15)
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Wheel bearings service
every 24 months, whichever occurs first). (23)(46)
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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)
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Diesel Only: Change engine
--
Eaton Axle (oil
-
filled) (or