1996 Buick Century Owner's Manual - Page 305

I - mg Tripmighway Maintenance Schedule 2) - 100,000 Miles (166 000 ' 0Drain, 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 cooling system and pressure cap. An Emission Control Service. In hilly or mountainous terrain. When doing frequent trailer towing. Uses such as found in taxi, police or delivery service. 3- IJ'yocrdo not use your vehicle under any of these conditions, the fluid and filter donot require changing. Inspect spark plug wires. An Emission Control Service. 0Replace spark plugs. An Erni,wion 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 temperature regularly reaches 90 O F (32°C) or higher. DATE ACTUAL MILEAGE SERVICED B Y