2003 Buick Century Owner's Manual - Page 319

When the system has calculated that oil life has been diminished, it will indicate that an oil change is necessary. A CHANGE ENGINE 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. 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. See Engine Oil on page 5-13 for information on resetting the system. After the services are performed, record the date, odometer reading and who performed the service on the maintenance record pages in Part E of this schedule. An Emission Control Service. 15,000 Miles (25 000 km) 0 Inspect engine air cleaner filter if you are driving in dusty conditions. Replace filter if necessary. An Emission Control Service. (See footnote f.) 0 Replace passenger compartment air filter. If you drive regularly under dusty conditions, the filter may require replacement more often. 0 Rotate tires. See Tire lnspection and Rotation on page 5-60 for proper rotation pattern and additional information. (See footnote @.) (See footnote +.) 22,500 Miles (37500 km) 0 Rotate tires. See Tire lnspection and Rotation on page 5-60 for proper rotation pattern and additional information. (See footnote 62.) (See footnote +.) 30,000 Miles (50 000 km) 0 Replace passenger compartment air filter. If you 7,500Miles (12 500 km) L l Rotate tires. See Tire lnspection and Rotation on page 5-60 for proper rotation pattern and additional information. (See footnote @.) (See footnote +.) drive regularly under dusty conditions, the filter may require replacement more often. 0 Rotate tires. See Tire lnspection and Rotation on page 5-60 for proper rotation pattern and additional information. (See footnote @.) (See footnote +.) D Replace engine air cleaner filter. An Emission Control Service. 6-6