1998 Oldsmobile Bravada Owner's Manual - Page 258

Refer to the Maintenance Schedule to determine when to replace the air filter. See "Scheduled Maintenance Services" in the Index. Automatic Transmission Fluid When to Check and Change A good time to check your automatic transmission fluid level is when the engine oil is changed. Operating the engine with the air cleaner off can cause you or others to be burned. The air cleaner not only cleans the air, it stops flame if 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 working on the engine with the air cleaner off. Change both the fluid and filter every 15,000 miles (25 000 k m ) if the vehicle is mainly driven under one or more of these conditions: 0 In heavy city traffic where the outside temperature regularly reaches 90°F (32°C) or higher. In hilly or mountainous terrain. When doing frequent trailer towing. Uses such as found in taxi, police or delivery service. 0 0 I NOTICE: If the air cleaner is off, a backfire can causea damaging engine fire. And, dirt caneasily get into your engine, which will damage it. Always have the air cleaner in place when you're driving. If you do not use yourvehicle under any of these conditions, change the fluid and filter every 50,000 miles (83 000 km). See "Scheduled Maintenance Services" in the Index. 6-16