Buick 1998 Riviera Owner's Manual page 328

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Short Trip/City Maintenance Schedule
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Replace air cleaner filter.
Inspect fuel tank, cap and lines for damage or leaks. Inspect fuel
An Emission Control Service.
cap gasket for any damage. Replace parts as needed.
An Emission Control Service. (See footnote?.)
For supercharged engines only: Check the supercharger oil level and add oil as
needed (or every 36 months, whichever occurs first). See "Recommended
Fluids and Lubricants" in this section.
An Emission Control Service. (See footnote?.)
rotation pattern and additional information. (See footnote
+.)
Cl
Rotate tires. See "Tire Inspection and Rotation" in the Index for proper
93,000 Miles (155 000 km)
0
Change engine oil and filter (or every 3 months, whichever occurs first).
An Emission Control Service.
96,000 Miles (I60 000 km)
0
Change engine oil and filter (or every 3 months, whichever occurs first).
An Emission Control Service.
DATE
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MILEAGE
(Continued)
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7-19