2007 GMC Acadia Owner's Manual - Page 503

When the CHANGE ENGINE OIL SOON 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 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. Scheduled Maintenance Service Change engine oil and filter. See Engine Oil on page 397. Reset oil life system. See Engine Oil Life System on page 400. An Emission Control Service. Visually check for any leaks or damage. See footnote (g). Inspect engine air cleaner filter. If necessary, replace filter. See Engine Air Cleaner/Filter on page 402. See footnote (l). Rotate tires and check inflation pressures and wear. See Tire Inspection and Rotation on page 448 and "Tire Wear Inspection" in At Least Once a Month on page 508. Inspect brake system. See footnote (a). Check engine coolant and windshield washer fluid levels and add fluid as needed Maintenance I • • Maintenance II 503