2006 Chevrolet Silverado 1500 Pickup Owner's Manual - Page 541

When the CHANGE ENGINE OIL message appears, certain services, checks, and inspections are required. Required services are described in the following for "Maintenance I" and "Maintenance II." Generally, it is recommended that your first service be Maintenance I, your second service be Maintenance II, and that you alternate Maintenance I and Maintenance II thereafter. However, in some cases, Maintenance II may be required more often. Maintenance I - Use Maintenance I if the CHANGE ENGINE OIL 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. Scheduled Maintenance Service Change engine oil and filter. See Engine Oil (Gasoline Engine) on page 5-20. Reset oil life system. See Engine Oil Life System (Gasoline Engine) on page 5-23. An Emission Control Service. Allison Transmission® only: Replace external control-main filter only at the first maintenance service performed on the vehicle. 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 (Gasoline Engines) on page 5-25. See footnote (p). Rotate tires and check inflation pressures and wear. See Tire Inspection and Rotation on page 5-82 and "Tire Wear Inspection" in At Least Once a Month on page 6-11 Maintenance I • Maintenance II • 6-5