2001 Buick Regal Owner's Manual - Page 340

Scheduled Maintenance 100,000 Miles (166 000 km) j Inspect spark plug wires. An Emission Control Service. j Replace spark plugs. An Emission Control Service. j Change 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_F (32_C) or higher. - In hilly or mountainous terrain. - When doing frequent trailer towing. - Uses such as found in taxi, police or delivery service. j If you haven't used your vehicle under severe service conditions listed previously and, therefore, haven't changed your automatic transaxle fluid, change both the fluid and filter. DATE ACTUAL MILEAGE SERVICED BY: 150,000 Miles (240 000 km) j 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 cooling system and pressure cap. An Emission Control Service. DATE ACTUAL MILEAGE SERVICED BY: 7-15