1997 Buick Regal Owner's Manual - Page 380

I Long Trip/Highway Maintenance Schedule 100,000 Miles (166 000 km) (Continued) - 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 what to use. for Inspect hoses. Clean radiator, condenser, pressure cap and neck. Pressure test the cooling system and pressure cap. An Emission Control Sewice. When doing frequent trailer towing. - Uses such as found in taxi, police or delivery service. If you do not use your vehicleunder any o these f conditions, the$uid and filter donot require changing. I I I DATE ACTUAL MILEAGE SERVICED B Y DATE ACTUAL MILEAGE SERVICED BY: 3 7-38