GM Service Manual Online
For 1990-2009 cars only

Perform the following services up to 166 000 km (100,000 mi) and after 166 000 km (100,000 mi) at the same intervals.

This vehicle has a computer that indicates when to change the engine oil. This is not based on mileage, but on engine revolutions and engine operating temperature. When the

1 600 km (1,000 mi)

Perform the wheel stud nut service. (46)

5 000 km (3,000 mi)

    • Check Oil Life Monitor. If engine oil and filter are changed, reset monitor. See "Engine Oil" in the Index. (3, 9)
    • Inspect the fluid levels - or every 3 months, whichever occurs first. (1, 2, 6)
    • Perform the clutch pedal free travel service. (10)
    • Perform the rear axle air shift motor service. (11)

10 000 km (6,000 mi)

    • Check the Oil Life Monitor. Change the engine oil and the filter, if necessary. Reset the monitor. (3, 9)
    • Inspect the fluid levels - or every 3 months, whichever occurs first. (1, 2, 6)
    • Perform the chassis lubrication service - or every 6 months, whichever occurs first. (12)
    • Perform the wheels and tires service. (15, 46)
    • Perform the hydraulic brake service - or every 6 months, whichever occurs first. (7)
    • Perform the hydraulic parking brake service - or every 6 months, whichever occurs first. (8)
    • Inspect the clutch pedal free travel. (10)

15 000 km (9,000 mi)

    • Check the Oil Life Monitor. Change the engine oil and the filter, if necessary. Reset the monitor. (3, 9)
    • Inspect the fluid levels - or every 3 months, whichever occurs first. (1, 2, 6)

20 000 km (12,000 mi)

    • Check the Oil Life Monitor. Change the engine oil and the filter, if necessary. Reset the monitor. (3, 9)
    • Inspect the fluid levels - or every 3 months, whichever occurs first. (1, 2, 6)
    • Perform the chassis lubrication service - or every 6 months, whichever occurs first. (12)
    • Perform the wheels and tires service. (15, 46)
    • Perform the hydraulic brake service - or every 6 months, whichever occurs first. (7)
    • Perform the hydraulic parking brake service - or every 6 months, whichever occurs first. (8)
    • Perform the engine drive belts service - or every 12 months, whichever occurs first. (18)
    • Inspect the clutch pedal free travel. (10)
    • Perform the thermostatically controlled engine cooling fan service. (4, 20)
    • Perform the shields and the underhood insulation service. (4, 5, 21)
    • Inspect the operation of the air brake relay valve operation for leaks - or every month or every 300 hours, whichever occurs first.

25 000 km (15,000 mi)

    • Check the Oil Life Monitor. Change the engine oil and the filter, if necessary. Reset the monitor. (3, 9)
    • Inspect the fluid levels - or every 3 months, whichever occurs first. (1, 2, 6)
    • Perform the steering system service. (13)
    • Perform the front and the rear suspension service. (14)
    • Perform the spring-to-axle U-bolts and the shackle bolts service. (16)
    • Perform the exhaust system service. (3, 4, 17)
    • Perform the air brake service - or every 6 months, whichever occurs first. (39)

30 000 km (18,000 mi)

    • Check the Oil Life Monitor. Change the engine oil and the filter, if necessary. Reset the Monitor. (3, 9)
    • Inspect the fluid levels - or every 3 months, whichever occurs first. (1, 2, 6)
    • Perform the chassis lubrication service - or every 6 months, whichever occurs first. (12)
    • Perform the wheels and tires service. (15, 46)
    • Perform the hydraulic brake service - or every 6 months, whichever occurs first. (7)
    • Perform the hydraulic brake caliper service - or every 6 months, whichever occurs first. (22)
    • Perform the hydraulic parking brake service - or every 6 months, whichever occurs first. (8)
    • Inspect the clutch pedal free travel. (10)
    • Clean airbrake application valve - or every 3 months or every 300 hours, whichever occurs first. Lubricate the linkage.

35 000 km (21,000 mi)

    • Check the Oil Life Monitor. Change the engine oil and the filter, if necessary. Reset the Monitor. (3, 9)
    • Inspect the fluid levels - or every 3 months, whichever occurs first. (1, 2, 6)

40 000 km (24,000 mi)

    • Check the Oil Life Monitor. Change the engine oil and the filter, if necessary. Reset the Monitor. (3, 9)
    • Inspect the fluid levels - or every 3 months, whichever occurs first. (1, 2, 6)
    • Perform the chassis lubrication service - or every 6 months, whichever occurs first. (12)
    • Perform the wheel bearing (grease) service - or every 24 months, whichever occurs first, and whenever the hubs are removed). (23)
    • Perform the wheels and tires service. (15, 46)
    • Perform the hydraulic brake service - or every 6 months, whichever occurs first. (7)
    • Perform the hydraulic parking brake service - or every 6 months, whichever occurs first. (8)
    • Perform the engine drive belts service - or every 12 months, whichever occurs first. (18)
    • Inspect the clutch pedal free travel. (10)
    • Perform the thermostatically controlled engine cooling fan service. (4, 20)
    • Perform the shields and the underhood insulation service. (4, 5, 21)
    • Perform the air intake system service - or every 24 months, whichever occurs first. (4, 5, 25)
    • Perform the Evaporative Control System service (ECS), if equipped - or every 24 months, whichever occurs first. (3, 26) [Dagger]
    • Perform the rear axle air shift motor service. (11)
    • Inspect the operation of the air brake relay valve for leaks - or every month or every 300 hours, whichever occurs first.
    • Perform the air brake chamber service - or every 2 months, whichever occurs first. (41)

45 000 km (27,000 mi)

    • Check the Oil Life Monitor. Change the engine oil and the filter, if necessary. Reset the Monitor. (3, 9)
    • Inspect the fluid levels - or every 3 months, whichever occurs first. (1, 2, 6)

50 000 km (30,000 mi)

    • Check the Oil Life Monitor. Change the engine oil and the filter, if necessary. Reset the monitor. (3, 9)
    • Inspect the fluid levels - or every 3 months, whichever occurs first. (1, 2, 6)
    • Perform the chassis lubrication service - or every 6 months, whichever occurs first. (12)
    • Replace the fuel filter(s) - or every 12 months, whichever occurs first. (3)
    • Replace the air cleaner filter - or every 24 months, whichever occurs first. (3, 4, 27)
    • Perform the steering system service. (13)
    • Perform the front and the rear suspension service. (14)
    • Perform the spring-to-axle U-bolts and the shackle bolts service. (16)
    • Perform the exhaust system service - or every 6 months, whichever occurs first. (3, 4, 17)
    • Perform the air brake service - or every 6 months, whichever occurs first. (39)
    • Perform the wheels and tires service. (15, 46)
    • Perform the hydraulic brake service - or every 6 months, whichever occurs first. (7)
    • Perform the hydraulic parking brake service - or every 6 months, whichever occurs first. (8)
    • Inspect the clutch pedal free travel. (10)
    • Perform the air brake automatic slack adjuster service - or every 500 hours, whichever occurs first. (40)

55 000 km (33,000 mi)

    • Check the Oil Life Monitor. Change the engine oil and the filter, if necessary. Reset the monitor. (3, 9)
    • Inspect the fluid levels - or every 3 months, whichever occurs first. (1, 2, 6)

60 000 km (36,000 mi)

    • Check the Oil Life Monitor. Change the engine oil and the filter, if necessary. Reset the Monitor. (3, 9)
    • Inspect the fluid levels or - every 3 months, whichever occurs first. (1, 2, 6)
    • Perform the chassis lubrication service or - every 6 months, whichever occurs first. (12)
    • Perform the wheels and tires service. (15, 46)
    • Perform the hydraulic brake service - or every 6 months, whichever occurs first. (7)
    • Perform the hydraulic brake caliper service - or every 6 months, whichever occurs first. (22)
    • Perform the hydraulic parking brake service - or every 6 months, whichever occurs first. (8)
    • Perform the engine drive belts service - or every 12 months, whichever occurs first. (18)
    • Inspect the clutch pedal free travel. (10)
    • Perform the thermostatically controlled engine cooling fan service. (4, 20)
    • Perform the shields and the underhood insulation service. (4, 5, 21)
    • Inspect the operation of the air brake relay valve for leaks - or every month or every 300 hours, whichever occurs first.
    • Clean air brake application valve - or every 3 month or every 300 hours, whichever occurs first. Lubricate the linkage.

65 000 km (39,000 mi)

    • Check the Oil Life Monitor. Change the engine oil and the filter, if necessary. Reset the Monitor. (3, 9)
    • Inspect the fluid levels - or every 3 months, whichever occurs first. (1, 2, 6)

70 000 km (42,000 mi)

    • Check the Oil Life Monitor. Change the engine oil and the filter, if necessary. Reset the monitor. (3, 9)
    • Inspect the fluid levels - or every 3 months, whichever occurs first. (1, 2, 6)
    • Perform the chassis lubrication service - or every 6 months, whichever occurs first. (12)
    • Perform the wheels and tires service. (15, 46)
    • Perform the hydraulic brake service - or every 6 months, whichever occurs first. (7)
    • Perform the hydraulic parking brake service - or every 6 months, whichever occurs first. (8)
    • Inspect the clutch pedal free travel. (10)

75 000 km (45,000 mi)

    • Check the Oil Life Monitor. Change the engine oil and the filter, if necessary. Reset the Monitor. (3, 9)
    • Inspect the fluid levels - or every 3 months, whichever occurs first. (1, 2, 6)
    • Perform the steering system service. (13)
    • Perform the front and rear suspension service. (14)
    • Perform the spring-to-axle U-bolts and the shackle bolts service. (16)
    • Perform the exhaust system service - or every 6 months, whichever occurs first. (3, 4, 17)
    • Perform the air brake service - or every 6 months, whichever occurs first. (39)

80 000 km (48,000 mi)

    • Check the Oil Life Monitor. Change the engine oil and the filter, if necessary. Reset the Monitor. (3, 9)
    • Inspect the fluid levels - or every 3 months, whichever occurs first. (1, 2, 6)
    • Perform the chassis lubrication service - or every 6 months, whichever occurs first. (12)
    • Perform the wheel bearing (grease) service - or every 24 months, whichever occurs first and whenever the hubs are removed). (23)
    • Perform the wheels and tires service. (15, 46)
    • Perform the hydraulic brake service - or every 6 months, whichever occurs first. (7)
    • Perform the hydraulic parking brake service - or every 6 months, whichever occurs first. (8)
    • Perform the engine drive belts service - or every 12 months, whichever occurs first. (18)
    • Inspect the clutch pedal free travel. (10)
    • Perform the shields and the underhood insulation service. (4, 5, 21)
    • Perform the air intake system service - or every 24 months, whichever occurs first. (4, 5, 24)
    • Perform the thermostatically controlled engine cooling fan service. (4, 20)
    • Perform the Evaporative Control System service (ECS) service, if equipped - or every 24 months, whichever occurs first. (3, 26) [Dagger]
    • Perform the rear axle air shift motor service. (11)
    • Inspect the operation of the air brake relay valve for leaks - or every month or every 300 hours, whichever occurs first.
    • Perform the air brake chamber service - or every 2 months, whichever occurs first. (37)

85 000 km (51,000 mi)

    • Check the Oil Life Monitor. Change the engine oil and the filter, if necessary. Reset the monitor. (3, 9)
    • Inspect the fluid levels - or every 3 months, whichever occurs first. (1, 2, 6)

90 000 km (54,000 mi)

    • Check the Oil Life Monitor. Change the engine oil and the filter, if necessary. Reset the Monitor. (3, 9)
    • Inspect the fluid levels - or every 3 months, whichever occurs first. (1, 2, 6)
    • Perform the chassis lubrication service - or every 6 months, whichever occurs first. (12)
    • Perform the wheels and tires service. (15, 46)
    • Perform the hydraulic brake service - or every 6 months, whichever occurs first. (7)
    • Perform the hydraulic brake caliper service - or every 6 months, whichever occurs first. (22)
    • Perform the hydraulic parking brake service - or every 6 months, whichever occurs first. (8)
    • Inspect the clutch pedal free travel. (10)
    • Clean the air brake application valve - or every 3 months or 300 hours, whichever occurs first. Lubricate the linkage.
    • Spark Plug Service. (3, 28)

95 000 km (57,000 mi)

    • Check the Oil Life Monitor. Change the engine oil and the filter, if necessary. Reset the Monitor. (3, 9)
    • Inspect the fluid levels - or every 3 months, whichever occurs first. (1, 2, 6)

100 000 km (60,000 mi)

    • Check the Oil Life Monitor. Change the engine oil and the filter, if necessary. Reset the Monitor. (3, 9)
    • Inspect the fluid levels - or every 3 months, whichever occurs first. (1, 2, 6)
    • Perform the chassis lubrication service - or every 6 months, whichever occurs first. (12)
    • Replace the fuel filter(s) - or every 12 months, whichever occurs first. (3)
    • Replace the air cleaner filter service - or every 24 months, whichever occurs first. (3) (4) (27)
    • Perform the steering system service. (13)
    • Perform the front and the rear suspension service. (14)
    • Perform the spring-to-axle U-bolts and the shackle bolts service. (16)
    • Perform the exhaust system service - or every 6 months, whichever occurs first. (3, 4, 17)
    • Perform the air brake service - or every 6 months, whichever occurs first. (39)
    • Perform the wheels and tires service. (15, 46)
    • Perform the hydraulic brake service - or every 6 months, whichever occurs first. (7)
    • Perform the hydraulic parking brake service - or every 6 months, whichever occurs first. (8)
    • Perform the engine drive belts service - or every 12 months, whichever occurs first. (18)
    • Inspect the clutch pedal free travel. (10)
    • Perform the thermostatically controlled engine cooling fan service. (4, 20)
    • Perform the shields and the underhood insulation service. (4, 5, 21)
    • Inspect the operation of the air brake relay valve for leaks - or every month or every 300 hours, whichever occurs first.
    • Perform the air brake automatic slack adjuster service - or every 500 hours, whichever occurs first. (40)

105 000 km (63,000 mi)

    • Check the Oil Life Monitor. Change the engine oil and the filter, if necessary. Reset the Monitor. (3, 9)
    • Inspect the fluid levels - or every 3 months, whichever occurs first. (1, 2, 6)

110 000 km (66,000 mi)

    • Check the Oil Life Monitor. Change the engine oil and the filter, if necessary. Reset the monitor. (3, 9)
    • Inspect the fluid levels - or every 3 months, whichever occurs first. (1, 2, 6)
    • Perform the chassis lubrication service - or every 6 months, whichever occurs first. (12)
    • Perform the wheels and tires service. (15, 46)
    • Perform the hydraulic brake service - or every 6 months, whichever occurs first. (7)
    • Perform the hydraulic parking brake service - or every 6 months, whichever occurs first. (8)
    • Inspect the clutch pedal free travel. (10)

115 000 km (69,000 mi)

    • Check the Oil Life Monitor. Change the engine oil and the filter, if necessary. Reset the monitor. (3, 9)
    • Inspect the fluid levels - or every 3 months, whichever occurs first. (1, 2, 6)

120 000 km (72,000 mi)

    • Check the Oil Life Monitor. Change the engine oil and the filter, if necessary. Reset the monitor. (3, 9)
    • Inspect the fluid levels - or every 3 months, whichever occurs first. (1, 2, 6)
    • Perform the chassis lubrication service - or every 6 months, whichever occurs first. (12)
    • Perform the wheel bearing (grease type) service - or every 24 months, whichever occurs first and whenever the hubs are removed. (23)
    • Perform the wheels and tires service. (15, 46)
    • Perform the hydraulic brake service - or every 6 months, whichever occurs first. (7)
    • Perform the hydraulic brake caliper service - or every 6 months, whichever occurs first. (22)
    • Perform the hydraulic parking brake service - or every 6 months, whichever occurs first. (8)
    • Perform the engine drive belts service - or every 12 months, whichever occurs first. (18)
    • Inspect the clutch pedal free travel. (10)
    • Perform Thermostatically controlled engine cooling fan service. (4, 20)
    • Perform the shields and the underhood insulation service. (4, 5, 21)
    • Perform the air intake system service - or every 24 months, whichever occurs first. (4, 5, 24)
    • Perform the fuel tank, the fuel cap, and the fuel lines service - or every 72 months, whichever occurs first. (3, 30) [Dagger]
    • Inspect the EGR system - or every 72 months, whichever occurs first. (3, 31)
    • Perform the Evaporative Control System service (ECS), if equipped - or every 24 months, whichever occurs first. (3, 26) [Dagger]
    • Perform the rear axle air shift motor service. (11)
    • Inspect the operation of the air brake relay valve for leaks (or every month - or every 300 hours, whichever occurs first.
    • Clean the air brake application valve - or every 3 months or 300 hours, whichever occurs first.
    • Perform the air brake chamber service - or every 2 months, whichever occurs first. (41)

125 000 km (75,000 mi)

    • Check the Oil Life Monitor. Change the engine oil and filter, if necessary. Reset the monitor. (3, 9).
    • Check fluid levels - or every 3 months, whichever occurs first. (1, 2, 6)
    • Perform the steering system service. (13)
    • Perform the front and the rear suspension service. (14)
    • Perform the spring-to-axle U-bolts and the shackle bolts service. (16)
    • Perform the exhaust system service - or every 6 months, whichever occurs first. (3, 4, 17)
    • Perform the air brake service - or every 6 months, whichever occurs first. (39)

130 000 km (78,000 mi)

    • Check the Oil Life Monitor. Change the engine oil and the filter, if necessary. Reset the Monitor. (3, 9)
    • Inspect the fluid levels - or every 3 months, whichever occurs first. (1, 2, 6)
    • Perform the chassis lubrication service - or every 6 months, whichever occurs first. (12)
    • Perform the wheels and tires service. (15, 46)
    • Perform the hydraulic brake service - or every 6 months, whichever occurs first. (7)
    • Perform the hydraulic parking brake service - or every 6 months, whichever occurs first. (8)
    • Inspect the clutch pedal free travel. (10)

135 000 km (81,000 mi)

    • Check the Oil Life Monitor. Change the engine oil and the filter, if necessary. Reset the Monitor. (3, 9)
    • Inspect the fluid levels - or every 3 months, whichever occurs first. (1, 2, 6)
    • Perform the wheel bearings service for the Eaton® Axle (oil filled) - or every 24 months, whichever occurs first. (23, 47)

140 000 km (84,000 mi)

    • Check the Oil Life Monitor. Change the engine oil and the filter, if necessary. Reset the monitor. (3, 9)
    • Inspect the fluid levels - or every 3 months, whichever occurs first. (1, 2, 6)
    • Perform the chassis lubrication service - or every 6 months, whichever occurs first. (12)
    • Perform the wheels and tires service. (15, 46)
    • Perform the hydraulic brake service - or every 6 months, whichever occurs first. (7)
    • Perform the hydraulic parking brake service - or every 6 months, whichever occurs first. (8)
    • Perform the engine drive belts service - or every 12 months, whichever occurs first. (18)
    • Inspect the clutch pedal free travel. (10)
    • Perform the thermostatically controlled engine cooling fan service. (4, 20)
    • Perform the shields and the underhood insulation service. (4, 5, 21)
    • Inspect the operation of the air brake relay valve for leaks - or every month or every 300 hours, whichever occurs first.

145 000 km (87,000 mi)

    • Check the Oil Life Monitor. Change the engine oil and the filter, if necessary. Reset the Monitor. (3, 9)
    • Inspect the fluid levels - or every 3 months, whichever occurs first. (1, 2, 6)

150 000 km (90,000 mi)

    • Check the Oil Life Monitor. Change the engine oil and the filter, if necessary. Reset the monitor. (3, 9)
    • Inspect the fluid levels - or every 3 months, whichever occurs first. (1, 2, 6)
    • Perform the chassis lubrication service - or every 6 months, whichever occurs first. (12)
    • Replace the fuel filter(s) - or every 12 months, whichever occurs first. (3)
    • Replace the air cleaner filter - or every 24 months, whichever occurs first. (3, 4, 27)
    • Perform the steering system service. (13)
    • Perform the front and the rear suspension service. (14)
    • Perform the spring-to-axle U-bolts and the shackle bolts service. (16)
    • Perform the exhaust system service. (3, 4, 17)
    • Perform the air brake service - or every 6 months, whichever occurs first. (39)
    • Perform the wheels and tires service. (15, 46)
    • Perform the hydraulic brake service - or every 6 months, whichever occurs first. (7)
    • Perform the hydraulic brake caliper service - or every 6 months, whichever occurs first. (22)
    • Perform the hydraulic parking brake service - or every 6 months, whichever occurs first. (8)
    • Inspect the clutch pedal free travel. (10)
    • Perform the air brake automatic slack adjuster service - or every 500 hours, whichever occurs first. (40)
    • Clean the air brake application valve - or every 3 months or 300 hours, whichever occurs first. Lubricate the linkage.

155 000 km (93,000 mi)

    • Check the Oil Life Monitor. Change the engine oil and the filter, if necessary. Reset the monitor. (3, 9)
    • Inspect the fluid levels - or every 3 months, whichever occurs first. (1, 2, 6)

160 000 km (96,000 mi)

    • Check the Oil Life Monitor. Change the engine oil and the filter, if necessary. Reset the monitor. (3, 9)
    • Inspect the fluid levels - or every 3 months, whichever occurs first. (1, 2, 6)
    • Perform the chassis lubrication service - or every 6 months, whichever occurs first. (12)
    • Lubricate the door hinge pins and rollers with engine oil.
    • Perform the wheel bearing (grease type) service - or every 24 months, whichever occurs first and whenever the hubs are removed). (23)
    • Perform the wheels and tires service. (15, 46)
    • Perform the hydraulic brake service - or every 6 months, whichever occurs first. (7)
    • Perform the hydraulic parking brake service - or every 6 months, whichever occurs first. (8)
    • Perform the engine drive belts service - or every 12 months, whichever occurs first. (18)
    • Inspect the clutch pedal free travel. (10)
    • Perform the thermostatically controlled engine cooling fan service. (4, 20)
    • Perform the shields and the underhood insulation service. (4, 5, 21)
    • Perform the air intake system service - or every 24 months, whichever occurs first. (4, 5, 24)
    • Perform the Evaporative Control System Service (ECS), if equipped - or every 24 months, whichever occurs first. (3, 26)[Dagger]
    • Perform the rear axle air shift motor service. (11)
    • Inspect the operation of the air brake relay valve for leaks - or every month or every 300 hours, whichever occurs first.
    • Perform the air brake chamber service - or every 2 months, whichever occurs first. (37)

165 000 km (99,000 mi)

    • Check the Oil Life Monitor. Change the engine oil and the filter, if necessary. Reset the monitor. (3, 9)
    • Inspect the fluid levels - or every 3 months, whichever occurs first. (1, 2, 6)

166 000 km (100,000 mi)

    • Change the power steering fluid - or every 36 months, whichever occurs first. (13)
    • Replace the power steering reservoir filter element - or every 24 months, whichever occurs first.
    • Perform the front axle service - or every 36 months, whichever occurs first. (38)
    • Perform the rear axle service for the Eaton®, or Spicer® Axles - or every 12 months, whichever occurs first. (37, 47)
    • Perform the exhaust brake service, if equipped. Inspect for excessive spindle free play and smooth operation. Lubricate the ball joint cap.
    • Perform the air brake service - or every 12 months, or 3,600 hours, whichever occurs first. (44)

240 000 km (150,000 mi)

Perform the cooling system service - or every 60 months since the last service, whichever occurs first. (3, 35)

320 000 km (200,000 mi)

Remove, disassemble, clean, and inspect the air brake trailer supply valve - or every 2 years or 7,200 hours, whichever occurs first.

400 000 km (250,000 mi)

    • Perform the wheel bearing service for the Eaton® Axle (oil filled) - or every 36 months, whichever occurs first. (23, 48)
    • Perform the rear axle service for the Eaton®, or Spicer® Axles - or every 36 months, whichever occurs first. (37, 48)
    • Change the manual transmission fluid - or every 60 months, whichever occurs first.

480 000 km (300,000 mi)

Remove, disassemble, clean, and inspect the air brake air dryer (or every 3 years or 10,800 hours, whichever occurs first. Replace the desiccant on the Bendix® AD-9 units.