1998 Buick Century Owner's Manual - Page 328

I MaintenanceSchedule I MILEAGE 7,500 Miles (12 500 km) "Engine Oil" in the Index. An Emission Control Service. (See footnote*.) 0 Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. (See footnote +.) 0 Check Oil Life Monitor. If engine oil and filter are changed,reset monitor. See 15,000 Miles (25 000 km) 0 Check Oil Life Monitor. If engine oiland filter are changed, reset monitor. See "Engine Oil" in the Index. An Emission Control Service. (See footnote *,) 0 Inspect 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. 0 Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. (See footnote+.) DATE ACTUAL MILEAGE 1 SERVICED B Y 22,500 Miles (37 500 km) C Check Oil Life Monitor. If engine oil and filter are l "Engine Oil" in the Index. An Emission Control Sewice. (See footnote *.) changed,reset monitor. See DATE ACTUAL MILEAGE SERVICED BY: 7-6