1998 Buick Riviera Owner's Manual - Page 328

I Short Trip/City Maintenance Schedule I Replace air cleaner filter. An Emission Control Service. Inspect fuel tank, cap and lines damage or leaks. Inspect fuel for cap gasket for any damage. Replace parts as needed. An Emission Control Service. (See footnote?.) For supercharged engines only: Check supercharger oil level and oil as the add needed (or every36 months, whichever occursfirst). See "Recommended Fluids and Lubricants" this section. in An Emission Control Service. (See footnote?.) Cl Rotate tires. See "Tire Inspection and Rotation" in the Indexfor proper rotation pattern and additional information. (See footnote +.) 93,000 Miles (155 000 km) 0 Change engineoil and filter (or every 3 months, whichever occurs first). An Emission Control Service. DATE I 96,000 Miles (I60 000 km) 0 Change engineoil and filter (or every 3 months, whichever occurs first). An Emission Control Service. MILEAGE (Continued) ? 7-19