Engine Oil Life SystemWhen to Change Engine OilYour vehicle has a computer system that lets you knowwhen to change the engine oil and filter. This is basedon engine revolutions and engine temperature, and noton mileage. Based on driving conditions, the mileageat which an oil change will be indicated can varyconsiderably. For the oil life system to work properly,you must reset the system every time the oil is changed.When the system has calculated that oil life has beendiminished, it will indicate that an oil change isnecessary. A change engine oil message in the DICwill come on. Change your oil as soon as possible withinthe next 600 miles (1 000 km). It is possible that,if you are driving under the best conditions, the oil lifesystem may not indicate that an oil change is necessaryfor over a year. However, your engine oil and filtermust be changed at least once a year and at this timethe system must be reset. Your dealer has GM-trainedservice people who will perform this work usinggenuine GM parts and reset the system. It is alsoimportant to check your oil regularly and keep it at theproper level.If the system is ever reset accidentally, you mustchange your oil at 3,000 miles (5 000 km) since yourlast oil change. Remember to reset the oil life systemwhenever the oil is changed.How to Reset the Engine Oil LifeSystem and the Oil Life IndicatorThe Engine Oil Life System calculates when to changeyour engine oil and filter based on vehicle use. Anytimeyour oil is changed, reset the system so it can calculatewhen the next oil change is required. If a situation occurswhere you change your oil prior to a change engine oilmessage in the DIC being turned on, reset the system.After the oil has been changed, the change engine oilmessage and the oil life indicator must be reset. To resetthe message and indicator, use one of the followingprocedures:Base Audio SystemPress the CLR button located to the right of the DICdisplay to acknowledge the change engine oil message.This will clear the message from the display and reset it.To reset the oil life indicator, use the following steps:1. Press the up or down arrow on the INFO buttonlocated to the right of the DIC display to accessthe DIC menu.2. Once XXX% ENGINE OIL LIFE menu item ishighlighted, press and hold the CLR button.The percentage will return to 100, and the oil lifeindicator will be reset. Repeat the steps if thepercentage does not return to 100.3. Turn the key to OFF.5-22
