1996 Buick Riviera Owner's Manual - Page 309

I Short Trip/City Maintenance Schedule Change engine oil and filter every (or 3 months., whichever occurs first). An Eiizission Control Service. I 27,000 Miles (45 000 km) 0Change engineoil and filter (or every 3 months, whichever occurs' first). An Emission Control Service. 24,000 Miles (40 000 km) 0Lubricate the suspensionand steering linkage, transaxleshift lmkage, parking brake cable guides and the underbody contact pointsand,linkage(or every 6 months, whichever occurs first). I DATE MILEAGE ACTUAL -SERVICED BY: .7-10