1997 Buick Regal Owner's Manual - Page 372

22,500 Miles (37 500 km) 0Change engine oil and filter (or every 12 months, whichever occurs first). An Emission Control Service. (See footnote *.) 0Rotate tires. See "Tire Inspection and Rotation'' in theIndex for proper rotation pattern and additional information. (See footnote +.) 30,000 Miles (50 000 km) 0Change engine oil and filter (or every 12 months, whichever occurs first). An Emission Control Service. (See footnote *.) 0Replace passenger compartment air filter. 0Rotate tires. See "Tire Inspection and Rotation" in the Index proper rotation for pattern and additional information. (See footnote +.) 0Replace air cleaner filter. An Emission Control Service. DATE ACTUAL MILEAGE SERVICED B Y 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. (See footnote?.)