1998 Buick Riviera Owner's Manual

0 Be sure to use the proper nuts, bolts andother fasteners. “English” and “metric”fasteners can be easily confused. If you usethe wrong fasteners, parts can later t[ akor fall off. You could be hurt.Adding Equipment to the Outside ofYour VehicleThings you might add to the outside of your vehicle canaffect the airflow around it. This may cause wind noiseand affect windsheld washer performance. Check withyour dealer before adding equipment to the outside ofyour vehicle.FuelUse premium unleaded gasoline rated at 91 octaneor higher. At a minimum, it should meet specificationsASTM D4814 in the United States and CGSB 3.5-M93in Canada. Improved gasoline specifications have beendeveloped by the American Automobile ManufacturersAssociation (AAMA) for better vehicle performanceand engine protection. Gasolines meeting the AAMAspecification could provide improved driveabilityand emission control system protection compared toother gasolines.Be sure the posted octane for premium is at least 91. Ifthe octane is less than 91, you may get a heavy knockingnoise when you drive. (In an emergency, you may beable to use a lower octane -- as low as 87 -- if heavyknocking does not occur.) If you’re using 91 or higheroctane unleaded gasoline and you hear heavy knocking,your engine needs service.If your vehicle is certified to meet California EmissionStandards (indicated on the underhood emission controllabel), it is designed to operate on fuels that meetCalifornia specifications. If such fuels are not availablein states adopting California emissions standards, yourvehicle will operate satisfactorily on fuels meetingfederal specifications, but emission control systemperformance may be affected. The malfunction indicatorlamp on your instrument panel may turn and/or on yourvehicle may fail a smog-check test. If this occurs, returnto your authorized Buick dealer for diagnosis todetermine the cause of failure. In the event it isdetermined that the cause of the condition is the type offuels used, repairs may not be covered by your warra6-3