2003 Pontiac Grand Prix Owner's Manual - Page 248

When to Change Engine Oil (GM Oil Life SystemTM) Your vehicle has a computer system that lets you know when to change the engine oil and filter. This is based on engine revolutions and engine temperature, and not on mileage. Based on driving conditions, the mileage at which an oil change will be indicated can vary considerably. 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 been diminished, it will indicate that an oil change is necessary. A CHANGE OIL SOON light will come on. Change your oil as soon as possible within the next two times you stop for fuel. It is possible that, if you are driving under the best conditions, the oil life system may not indicate that an oil change 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. It is also important to check your oil regularly and keep it at the proper level. How to Reset the GM Oil Life System The GM Oil Life SystemTM calculates when to change your engine oil and filter based on vehicle use. Anytime your oil is changed, resetthe system so it can calculate when the next oil change is required. If a situation occurs where you change your oilprior to a CHANGE OIL SOON light being turned on, resetthe system. To reset the GM Oil Life SystemTM after the oil has been changed, use one of the following two procedures: Using the Driver Information Center (DIC) 1. With the ignition key in RUN but the engine off, fully push and release the accelerator pedal slowly three times within five seconds. 2. If the CHANGE OIL SOON light flashes, the system is resetting. 3. Turn the key to OFF after the light stops flashing, then start the vehicle. If the CHANGE OIL SOON light comes back on, the engine oil life monitor has not reset. Repeat the procedure. Using the Trip Computer (If Equipped) 1. Press the MODE button until the light appears lit next to OIL LIFE. 2. Press and hold the RESET button for three seconds. The oil life percentage should change to 100%. If the system is ever reset accidentally, you must change your oil at 3,000 miles (5 000 km) since your last oil change. Remember to reset the oil life system whenever the oil is changed. 5-23