2007 Chevrolet Avalanche Owner's Manual - Page 574

Maintenance I - Use Maintenance I if the CHANGE ENGINE OIL SOON message comes on within 10 months since the 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 10 months or more since the last service or if the message has not come on at all for one year. Maintenance I Maintenance II Scheduled Maintenance Service Change engine oil and filter. See Engine Oil on page 454. Reset oil life system. See Engine Oil Life System on page 457. 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 459. See footnote (l). Rotate tires and check inflation pressures and wear. See Tire Inspection and Rotation on page 515 and "Tire Wear Inspection" in At Least Once a Month on page 581. 574