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 isbased on engine revolutions and engine temperature,and not on mileage. Based on driving conditions,the mileage at which an oil change will be indicated canvary considerably. For the oil life system to workproperly, you must reset the system every time theoil is changed.Notice: If your vehicle is an STS-V model, theengine uses a special oil filter. The use of any otherengine oil filter could lead to filter failure andresult in severe engine damage. Damage caused byuse of the wrong engine oil filter would not becovered by your new vehicle warranty.When the system has calculated that oil life has beendiminished, it will indicate that an oil change isnecessary. A CHANGE ENGINE OIL SOON message inthe DIC will come on. See DIC Warnings and Messageson page 3-79. Change your oil as soon as possiblewithin the 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 LifeSystemThe Engine Oil Life System calculates when to changeyour engine oil and filter based on vehicle use.Anytime your oil is changed, reset the system so it cancalculate when the next oil change is required. If asituation occurs where you change your oil prior to aCHANGE ENGINE OIL SOON message in the DICbeing turned on, reset the system.5-24
