1996 Buick Riviera Owner's Manual - Page 334

Long 'I'rip/Highway Maintenance Scheduh 100,000 Miles (166 000 km) Drain, flush and refill cooling system (or every 60 months since last service, whichever occurs first). See "Engine Coolant'' in the Index€or what to ,use. Inspect hoses. Clean radiator, condenser, pressure cap and neck,Pressuretest the cooling systemand pressure cap.An Emission Control Service. 0Change automatic transaxle fluid and filter or if the vehicleis mainly driven under one more of these conditions: - In heavy city traffic where the outside 90 temperature regularly reaches O F (32 O C) or higher. - In hilly or mountainous terrain. - When doing frequent trailer towing. - Uses such as found in taxi, police or delivery service. If you do not use your vehicle underany of these conditims,thefluid andfilter not require changing.. do 0Inspect sparkphg wires. An Emission Control Service. [7 Replace spark plugs. Emission Control An Sewice. I 'DATE I ACTUALMILEAGE ISERVICED BY:^ 7-35