2004 Chevrolet Avalanche Owner's Manual - Page 481

Maintenance I - Use Maintenance I if the CHANGE ENGINE OIL message comes on within ten months since vehicle was purchased or Maintenance II was performed. Maintenance II - Use Maintenance II if the previous service performed was Maintenance I. Always use Maintenance II whenever the message comes on ten months or more since the last service or if the message has not come on at all for one year. Scheduled Maintenance Service Change engine oil and filter. Reset oil life system. See Engine Oil on page 5-16. An Emission Control Service. Lubricate chassis components. See footnote #. Visually check for any leaks or damage. See footnote (j). Inspect engine air cleaner filter or change indicator (if equipped). If necessary, replace filter. See Engine Air Cleaner/Filter on page 5-21. An Emission Control Service. See footnote †. Rotate tires and check inflation pressures and wear. See Tires on page 5-64. Inspect brake system. See footnote (a). Check engine coolant and windshield washer fluid levels and add fluid as needed. Perform any needed additional services. See "Additional Required Services" in this section. Inspect suspension and steering components. See footnote (b). Inspect engine cooling system. See footnote (c). Inspect wiper blades. See footnote (d). Maintenance I Maintenance II 6-5