1997 Buick Riviera Owner's Manual - Page 321
1997 Buick Riviera Manual
Page 321 highlights
9,000 Miles (15 000 km) I A. 0Change engineoil and filter '(orevery 3 months, whicheveroccults first). An Emission Control Seuvicb,~. ~~ ~ DAW ACTUAL MILEAGE SERVJCED BY:
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