1997 Buick Park Avenue Owner's Manual - Page 371

I Short Trip/City Maintenance Schedule - When doing frequent trailer towing. - Uses such as found in taxi, police or delivery service. I f you do not use your vehicle under any of these conditions, the fluid and filter donot require changing. [ 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 Sewice. DATE ACTUAL MILEAGE 'SERVICEDBY: DATE MILEAGE ACTUAL SERVICED BY 7-27