1997 Buick Century Owner's Manual - Page 366

I Long Tripmighway Maintenance Schedule 100,000 Miles (166 000 km) (Continued) - Uses such as found in taxi, police or 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 Service. delivery service. If you do not use your vehicle under any o these colzditions, the fluid and filter do f not require changing. I DATE I ACTUAL MILEAGE JSERVICEDBY: I I DATE I ACTUAL MILEAGE lSERVICED BY: I 7-36