1997 Oldsmobile Bravada Owner's Manual - Page 223

If you're using fuel rated at87 octane or higher and you still hearheavy knocking, your engine needs service. But don'tworry if you hear a little pinging noise when Things you might add to the outside of your vehicle can you're accelerating or driving up a hill. That's normal, affect the airflow around it. This may cause wind noise and you don't have to buy a higher octane fuel to get rid and affect windshield washer performance. Check with of pinging. It's the heavy, constant knock that means your Oldsmobile retailer before adding equipment to the you have a problem. outside of your vehicle. If your vehicleis certified tomeet California Emission Standards (indicated on the underhood tune-up label), it Fuel is designed to operate on fuels that meet California Use regular unleaded gasoline rated at 87 octane or specifications. If such fuels are not available in states higher. At a minimum,it should meet specifications adopting California emissions standards, your vehicle ASTM D4814 in the United States and CGSB 3.5-M93 will operate satisfactorily on fuels meeting federal in Canada. Improved gasoline specifications have been specifications, but emission control system performance developed by the American Automobile Manufacturers may be affected. The malfunction indicator lamp on Association ( M A ) for better vehicle performance your instrument panelmay t u r n on and/oryour vehicle and engine protection. Gasolines meeting the AAMA may fail a smog-check test. If this occurs, return to your specification could provide improved driveability and authorized Oldsmobile retailer for diagnosis to emission control system protection compared to determine the cause of failure. In the event it is other gasolines. determined that the cause of the condition is the type of fuels used, repairs may not be covered byyour warranty. Be sure the posted octane is at least 87. If the octane is less than 87,you may get a heavy knocking noise when you drive. If it's bad enough,it can damage your engine. Adding Equipmentto the Outside of Your Oldsmobile