1997 Buick Riviera Owner's Manual - Page 327

I Short Trip/City Maintenance Schedule - 39,000 Mill- (65 000 km) 0Change er .ne oil and filter (or every 3 months, whichever occurs first). An Emission Control Service. 42,000 Miles (70 000 km) Change engine oil 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 +.) DATE I I I ACTUAL MILEAGE SERVICED BY: DATE MILEAGE ACTUAL SERVICED BY 7-14