1997 Buick Riviera Owner's Manual - Page 339

1 Short TriplCity Maintenance Schedule Change engine oil and filter (or every 3 months, whichever occursfirst). An Emission Control Service. 1 100,000 Miles (166 000 km) 0Inspect spark plug wires. An Emission ControlService. 99,000 Miles (165000 km) 0Replace spark plugs. An Emission Control Service. 0Change automatictransaxle fluid and filter if the vehicle mainly driven under oneor is more of these conditions: - In heavy city traffic wherethe outside 90 temperature regularly reaches O F (32"C) or higher. - In hilly or mountainous terrain. I I I 1 ~ DATE MILEAGE ACTUAL SERVICED BY: DATE MILEAGE ACTUAL SERVICED BY: 7-26