2005 Buick Century Owner's Manual - Page 313

Additional Required Services (cont'd) Service and Miles (Kilometers) Replace spark plugs and inspect spark plug wires. An Emission Control Service. Engine cooling system service (or every 5 years, whichever occurs first). An Emission Control Service. See footnote (i). Inspect engine accessory drive belt. An Emission Control Service. 25,000 (41 500) 50,000 (83 000) 75,000 (125 000) 100,000 (166 000) • 125,000 (207 500) 150,000 (240 000) • • 6-7