1998 Buick LeSabre Owner's Manual - Page 336

Long Trip/Highway Maintenance Schedule 37,500Miles (62 500 km) (Continued) 0 Rotate tires. See "Tire Inspection and Rotation'' in theIndex for proper rotation pattern and additional information. (See footnote +.) 45,000 Miles (75 000 km) 0 Change engine oil and filter (or every 12 months, whichever occurs first). An Emission Control Sewice. (See footnote *.) Lubricate chassis components (or every 12 months, whichever occurs first). (See footnote #.) 0 Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. (See footnote +.) (Also see footnote ++.) DATE 50,000 Miles (83 000 km) 0 Change automatic transaxle fluid and filter if the vehicle is mainly driven under one or more of these conditions: - In heavy city traffic where the outside temperature regularly reaches 90°F (32 O C) orhigher. - In hilly or mountainous terrain. - When doing frequent trailer towing. - Uses such as found in taxi, police or delivery service. If you do not use your vehicle under any ($these conditions, the fluid and filter do not require changing. MILEAGE 7-24