2002 Chevrolet Avalanche Owner's Manual - Page 339

Engine Oil Additives Don't add anything to your oil. The recommended oils with the starburst symbol are all you will need for good performance and engine protection. When to Change Engine Oil (GM Oil Life System ) t Your vehicle has a computer that lets you know when to change your engine oil. This is not based on mileage, but on engine revolutions and engine operating temperature. When the computer has calculated that the oil needs changing, the GM Oil Life System will indicate that a change is necessary. Change your oil as soon as it is possible within the next two times you stop for fuel. The mileage between oil and filter changes will vary depending on how you drive your vehicle -- usually between 3,000 miles (5 000 km) and10,000 miles (16 000 km) since your last oil and filter change. Under severe conditions, the system may come on before 3,000 miles (5 000 km). Never drive your vehicle more than 10,000 miles (16 000 km) or 12 months (whichever occurs first) without an oil change. Remember to reset the CHANGE ENGINE OIL light whenever the oil is changed. For the Oil Life System to work properly, you must reset the system each time the oil is changed. t 6-16