1997 Buick Riviera Owner's Manual - Page 254

Supercharger Oil Operating theengine withthe aircleaner off can cause you or others to burned. The air be cleaner not only cleans theair, it stops flameif the engine backfires. If it isn't there, and the engine backfires, you could be burned.Don't drive with it off, and be careful workingon the engine with the aircleaner off. Unless you are technically qualified and have the proper tools, you should let your dealeror a qualified service center perform this maintenance. NOTICE: If the air cleaner is off, a backfire can cause a damaging enginefire. And, dirt caneasily get into your engine, which damage it. Always will have theair cleaner in place when you're driving. When to Check r) Check oil level every 30,000 miles (50 000 kn or every 36 months, whichever occursfirst. What Kind of Oil to Use See "Recommended Fluids and Lubricants" the Index in and use only recommended oil. the 6-17