1997 Buick LeSabre Owner's Manual - Page 350

b I I Long TriplHighway Maintenance Schedule I 100,000 Miles (166 000 km) (Continued) In hilly or mountainous terrain. - When doing frequent trailer towing. - Uses such as found in taxi, police or delivery service. - 150,000 Miles (240 000 km) 0Drain, flush and refill cooling system (or every60 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. If you do not use your vehicle under any of these conditions, thefluid andfilter not require do changing. DATE ACTUAL MILEAGE SERVICED BY: I I I 7-38