2004 Buick Regal Owner's Manual - Page 318

Additional Required Services The following services should be performed at the first maintenance service (I or II) after the indicated miles (kilometers) shown for each item. Service Inspect fuel system for damage or leaks. Inspect exhaust system for loose or damaged components. Replace engine air cleaner filter. See Engine Air Cleaner/Filter on page 5-22. An Emission Control Service. Supercharger service (if equipped). An Emission Control Service. See footnotes † and (l). Change automatic transaxle fluid and filter (severe service). See footnote (h). Change automatic transaxle fluid and filter (normal service). Replace spark plugs. 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 6-6