1995 Buick Riviera Owner's Manual - Page 283

I Maintenance Schedule I I 24,000 Miles (40 000 km) 27,000 Miles (45 000 km) 1 I3 Change engine oil and filter (or every 3 months, whichever occurs first). rZ Emiuion Control Sewice,. I DATE MILEAGE ACTUAL SERVICED BY: DATE MILEAGE ACTUAL SERVICED BY: 7-10