1997 Buick Riviera Owner's Manual - Page 326

I Short Trip/City Maintenance Schedule I 36,000 Miles (60 000 km) 0Change engineoil and filter (or every 3 months, whichever occurs first). An Emission Control Service. 33,000 Miles (55 000 km) 17 Change engineoil and filter (or every 3 months, whichever occurs first). An Emission Control Service. 0Lubricate chassis components (or every 6 months, whichever occurs first). (See footnote#.) 0Rotate tires. See "Tire Inspection and Rotation'' in the Index for proper rotation pattern and additional information. (See footnote+.) I DATE I ACTUALMILEAGE ISERVICED BY:I I DATE I ACTUALMILEAGE SERVICED BY: 7-13