1998 Buick Riviera Owner's Manual - Page 244

0 Be sure to use the proper nuts, bolts and other fasteners. "English" and "metric" fasteners can be easily confused. If you use the wrong fasteners, parts can later t[ ak or falloff. You could be hurt. and engine protection. Gasolines meeting AAMA the specification could provide improved driveability and emission control system protection compared to other gasolines. Things you might add to outside of your vehicle can the affect the airflow aroundit. This may cause wind noise and affectwindsheld washer performance. Check with your dealerbefore adding equipment to the outside of your vehicle. If your vehicleis certified to meet California Emission Standards (indicatedon the underhood emission control label), it is designed to operateon fuels that meet California specifications.If such fuels are not available in states adopting California emissions standards, your vehicle will operate satisfactorily on fuels meeting federal specifications, but emission control system Fuel performance may be affected. The malfunction indicator lamp on your instrument panel may turn and/or your on Use premium unleaded gasoline rated at 91 octane vehicle may fail a smog-check test.If this occurs, return or higher. At a minimum, should meet specifications it to your authorized Buick dealer diagnosis to for ASTM D4814 in the United States and CGSB 3.5-M93 determine the cause failure. In the eventit is of in Canada. Improved gasoline specifications have been of developed by the American Automobile Manufacturers determined that the cause the conditionis the type of fuels used, repairs may not be covered by your warra Association (AAMA)for better vehicle performance Adding Equipment to the Outside of Your Vehicle Be sure the posted octane premium is at least 9 If for 1. the octane is than 9 1, you may get a heavy knocking less noise when you drive. (In an emergency, you may be able to use a lower octane as low as87 -- if heavy -knocking does not occur.) If you're using or higher 91 octane unleaded gasoline and you hear heavy knocking, your engine needs service. 6-3