1995 Buick Century Owner's Manual - Page 271

Maintenance Schedule I 30,000 Miles (50 000 km) 0Change engine oil and filter (or every 3 months, whichever occurs first). An Emission Control Service. 0Replace spark plugs (except 2.2L Code 4 engine). An Emission Control Service. 0Inspect spark plug wires.An Emission Control Service. 0Lubricate the transaxle shift linkage, 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 engine accessory drive belt (or every 24 months, whichever occurs first). Drain, flush and refill cooling system (or every 24 months, whichever occurs first). See "Engine Coolant" in the Index for what to use. Inspect hoses. Clean radiator, condenser, pressure cap and neck. Pressure test the cooling system and pressure cap. An Emission Control Service. 0Replace air cleaner filter. Replace filter more often under dustyconditions. An Emission Control Service. 0Inspect Exhaust Gas Recirculation (EGR) system (2.2L Code 4 engine only). An Emission Control Service. ? c Inspect fuel tank, cap and lines for damage ] or leaks. Inspect fuel cap gasket for any damage. Replace parts as needed. An Emission Control Service. (Continued) 7-11