If the Engine Oil Life System
Beginning with 2004 models, vehicle maintenance is determined through the General Motors ENGINE OIL LIFE SYSTEM. This system uses the Driver Information Center (DIC) and operates as follows:
When the CHANGE ENGINE OIL light in the (DIC) comes on, it means that service is required for your vehicle, as soon as possible, within the next 600 miles. It is possible that, if you are driving in the best conditions, the Engine Oil Life System may not indicate that vehicle service is necessary for over a year. However, your engine oil and filter must be changed at least once a year and at this time the system must be reset. Your Certified Service dealer has GM-trained service technicians who will perform this work using Genuine GM Parts and then reset the system.
NOTICE: It is important to check your oil regularly and keep it at the proper level. Failure to keep your engine oil at the proper level can cause damage to your engine not covered by your warranty.
If the Engine Oil Life System is ever reset accidentally, you must service your vehicle within 3,000 miles since your last service. Remember to reset the system whenever the oil is changed. Required services are listed as "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 I and II thereafter. However, in some cases, Maintenance II may be required more often.