100000 MI or 160000 KM

Lubricate
    Steering and Suspension
      Lubricate the front suspension, ball joints, steering linkage, transmission shift linkage, transfer case shift linkage, parking brake cable guides, and brake front axle. Ball joints should not be lubricated unless their temperature is -12 degrees C (10 degrees F) or higher or they could be damaged.
Inspect
    Positive Crankcase Ventilation Valve
    Ignition Cable
Replace
    Spark Plug
    Oil Filter, Engine
    Fluid Filter - A/T
    Fluid - Transfer Case
      Automatic Transfer Case Only.
    Fluid - A/T
    Engine Oil
      Change engine oil and filter as indicated by the GM Oil Life System (or every 12 months, whatever occurs first). Reset the indicator. Never drive the vehicle more than 16 000 km (10,000 miles) without and oil and filter change. The system will not detect dust in the oil. If the vehicle is driven in a dusty area, be sure to change the oil every 5 000 km (3,000 miles) or sooner.