1997 Buick Regal Owner's Manual - Page 375

I LongTriplHighwayMaintenanceSchedule I 52,500 Miles (87 500 km) 0Change engine oil and filter (or every 12 months, whichever occurs first). An Emission Control Service. (See footnote *.) 0Rotate tires. See "Tire Inspection and Rotation" in the Indexfor proper rotation pattern and additional information. (See footnote +.) 60,000 Miles (100 000 km) 0Change engine oil and filter (or every 12 months, whichever occurs first). An Emission Control Service. (See footnote * .) Replace passenger compartment air filter. 0For supercharged engines only: Check the supercharger oil level and addoil as needed (or every 36 months, whichever occurs first). See "Recommended Fluids and Lubricants" in this section. An Emission Condrol Service. (See footnote?.) 0Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. (See footnote +.) (Continued) DATE ACTUAL MILEAGE SERVICED B Y 7-33