1997 Buick Regal Owner's Manual - Page 369

I Short Trip/City Maintenance Schedule I 150,000 Miles (240 000 km) 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 cooling system and pressure cap. An Emission Control Service. - When doing frequent trailer towing. - Uses such as found in taxi, police or delivery service. If you do not your vehicle underany use o these conditions, the f fluid and filter do not require changing. DATE ACTUAL MILEAGE SERVICED BY: DATE ACTUAL MILEAGE SERVICED BY: 7-27