1997 Buick Skylark Owner's Manual - Page 335

Long TriplHighway Maintenance Schedule 100,000 Miles (166 000km) (Continued) I - In hilly or mountainous terrain. 150,000 Miles (240 000 km) 0Drain, flush and refill cooling system (or every 60 months since last service, whichever occurs first). "Engine See Coolant'' in the Index for what to use. Inspect hoses. Clean radiator, condenser, pressure cap and neck. Pressure test the cooling system and pressure cap. An Emission Control Service. - When doing frequent trailer towing. - Uses such as foundin taxi, police or delivery service. If you do not use your vehicle under any these of conditions, thefluid andfilter not require changing. do I I I DATE MILEAGE ACTUAL SERVICED BY: DATE MILEAGE ACTUAL SERVICED BY: I 7-38