1996 Buick Skylark Owner's Manual - Page 323

Long Trip/Highway Maintenance Schedule 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 for what to use. Inspect hoses. Clean radiator, condenser, pressure cap and neck. Pressure test the An cooling system and pressure cap. Emission Control Service. 0Change automatic transaxle fluid and filter if the vehicle is mainly driven under one or more of these conditions: In heavy city traffic where the outside 90 temperature regularly reaches O F (32 C) or higher. In hilly or mountainous terrain. When doing frequent trailer towing. or Uses such as found in taxi, police delivery service. O 0Inspect spark plug wires (except 2.4L Code T engine). An Emission ControlService. Replace spark plugs. Emission Control An Service. If you do not use your vehicle under any these of conditions,thefluid andfflter do require changing. not 7-34