1997 Buick Regal Owner's Manual - Page 379

ng TriplHighway Maintenanc Schedule 97,500 Miles (162 500 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 the Index for proper rotation pattern and additional information. (See footnote +.) 100,000 Miles (166 000 km) 0Inspect spark plug wires. An Emission Control Service. 17 Replace spark plugs. An Emission Control Service. I7 Change automatic transaxle fluid and filter if the vehicle is mainly driven under one or more of these conditions: - In heavy city traffic where the outside temperature regularly reaches 90 O F (32°C) or higher. - In hilly or mountainous terrain. (Continued) 7-37