1999 Buick Riviera Owner's Manual - Page 311

yellowblue Short Trip/City Scheduled Maintenance j Lubricate chassis components (or every 6 months, whichever occurs first). (See footnote #.) j Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. (See footnote +.) j Change engine oil and filter (or every 3 months, whichever occurs first). An Emission Control Service. j Inspect air cleaner filter if you are driving in dusty conditions. Replace filter if necessary. An Emission Control Service. (See footnote[.) 15,000 Miles (25 000 km) DATE ACTUAL MILEAGE SERVICED BY: 18,000 Miles (30 000 km) j Change engine oil and filter (or every 3 months, whichever occurs first). An Emission Control Service. j Lubricate chassis components (or every 6 months, whichever occurs first). (See footnote #.) j Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. (See footnote +.) DATE ACTUAL MILEAGE SERVICED BY: 7-9