1996 Buick Century Owner's Manual - Page 281

I Short TripKity Maintenance Schedule 1 0Inspect fuel tank, cap and lines for damage or leaks. Inspect fuel cap gasket for any damage. Replace parts as needed. An Emission Control Service. 30,000 Miles (50000 km) 0Change 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). Replace air cleaner filter. An Emission Control Service. 0Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. During tire rotation, check brake calipers for freedom of movement. Refer to the appropriate GM service manual for proper caliper service procedures. 0Inspect Exhaust Gas Recirculation (EGR) system (2.2L Code 4 engine only). An Emission Control Service. 3- 7-11