1996 Buick Century Owner's Manual - Page 278

I Short Trip/City Maintenance Schedule I 15,000 Miles (25 000 km) 0Change engine oil and filter (or every 3 months, whichever occurs first). An Emission Control Service. 12,000 Miles (20 000 km) Change engine oil and filter (or every 3 months, whichever occurs first). An Emission Control Service. 0Lubricate the parking brake cable guides, underbody contact points and linkage. If equipped with grease fittings, lubricate the suspension and steering linkage (or every 6 months, whichever occurs first). 0Inspect air cleaner filter if you are driving in dusty conditions. Replace filter if necessary. An Emission Control Sewice. I I DATE ACTUAL MILEAGE SERVICED BY. DATEMILEAGE ACTUAL SERVICED BY: 7-8