Buick 1998 Riviera Owner's Manual page 337

75,000 Miles (125 000 km)
Change engine oil and filter (or every 12 months, whichever occurs first).
An Emission Control Service.
0
Lubricate chassis components (or every 12 months, whichever occurs first).
0
Rotate tires. See "Tire Inspection and Rotation'' in the Index for proper
(See footnote
#.)
rotation pattern and additional information. (See footnote
+.)
82,500 Miles (137 500 km)
0
Change engine oil and filter (or every 12 months, whichever occurs first).
Lubricate chassis components (or every 12 months, whichever occurs first).
El Rotate tires. See "Tire Inspection and Rotation" in the Index for proper
An Emission Control Service.
(See footnote
#.)
rotation pattern and additional information. (See footnote
+.)
90,000 Miles (150 000 km)
Change engine oil and filter (or every 12 months, whichever occurs first).
An Emission Control Sewice.
0
Lubricate chassis components (or every 12 months, whichever occurs first).
(See footnote
#.)
MILEAGE
DATE
I
7-28