1998 Chevrolet Express Van Owner's Manual - Page 243

1 If your vehicleis certified to meet California Emission Standards (inhcated on the underhood emission control label), it isdesigned to operate on 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 performance maybe affected. The malfunction indicator lamp on your instrument panel may on andor your turn return vehicle mayfail a smog-check test. If this occurs, to your authorizedGM dealer for diagnosis to determine the cause of failure. In theevent it is. determined that the cause of the condition is the type of fuels used, repairs may not be covered by your warranty. Some gasolines that are not reformulatedfor low emissions contain an octane-enhancing additive called methylcyclopentadienyl manganese tricarbonyl (MMT); ask your servicestation operator whether or not hisfuel contains MMT. General Motors does notrecommend the use of such gasolines.If fuels containing MMT are used, spark plug life may be reduced and your emission control system performance may affected. The be malfunction indicator lamp on your instrument panel may turn on. If this occurs, returnto your authorized GM dealer for service. To provide cleaner air,all gasolines inthe United States are now required to contain additives that will help prevent deposits from forming in yourengine and fuel system, allowing your emission control system to function properly. Therefore, you should not have add to anything to the fuel. In addition, gasolines containing oxygenates, such asethers and ethanol, and reformulated gasolines may be available in your area to help clean the air. General Motors recommends that you use these gasolines if they comply with the specifications described earlier. 1 , NOTICE: Your vehicle was not designed fuel that for contains methanol. Don't .use it. It can corrode metal parts in your fuel system and also damage plastic and rubber parts. That damage wouldn't be covered under your warranty. ~ ~ i 6-4 I