Engine Oil Additives / Engine OilFlushesDo not add anything to the oil. The recommended oilswith the starburst symbol that meet GM standards areall that is needed for good performance and engineprotection.Engine oil system flushes are not recommended andcould cause engine damage not covered by the vehiclewarranty.Engine Oil Life SystemWhen to Change Engine OilThis vehicle has a computer system that indicates whento change the engine oil and filter. This is based onengine revolutions and engine temperature, and not onmileage. Based on driving conditions, the mileage atwhich an oil change is indicated can vary considerably.For the oil life system to work properly, the systemmust be reset every time the oil is changed.When the system has calculated that oil life has beendiminished, it indicates that an oil change is necessary.A CHANGE ENGINE OIL SOON message comes on.See DIC Warnings and Messages on page 3-56.Change the oil as soon as possible within the next600 miles (1 000 km). It is possible that, if driving underthe best conditions, the oil life system might notindicate that an oil change is necessary for over a year.However, the engine oil and filter must be changed atleast once a year and at this time the system mustbe reset. Your dealer/retailer has trained service peoplewho will perform this work using genuine parts andreset the system. It is also important to check the oilregularly and keep it at the proper level.If the system is ever reset accidentally, the oil must bechanged at 3,000 miles (5 000 km) since the last oilchange. Remember to reset the oil life system wheneverthe oil is changed.How to Reset the Engine Oil LifeSystemThe Engine Oil Life System calculates when to changethe engine oil and filter based on vehicle use. Wheneverthe oil is changed, reset the system so it can calculatewhen the next oil change is required. If a situation occurswhere the oil is changed prior to a CHANGE ENGINE OILSOON message being turned on, reset the system.Always reset the engine oil life to 100% after every oilchange. It will not reset itself. To reset the EngineOil Life System:1. Display the OIL LIFE REMAINING on the DIC.2. Press and hold the SET/RESET button on the DICfor more than five seconds. The oil life will changeto 100%.6-18
