1999 Honda Civic Owner's Manual - Page 124

Break-in Period, Gasoline Break-in Period Help assure your car's future reliability and performance by paying extra attention to how you drive during the first 600 miles (1,000 km). During this period: Avoid full-throttle starts and rapid acceleration. Avoid hard braking. New brakes need to be broken-in by moderate use for the first 200 miles (300 km). You should follow these same recommendations with an overhauled or exchanged engine, or when the brakes are relined. Gasoline Your Honda is designed to operate on unleaded gasoline. We recommend gasolines containing detergent additives that help prevent fuel system and engine deposits. Using gasoline containing lead will damage your car's emissions controls. This contributes to air pollution. In Canada, some gasolines contain an octane-enhancing additive called MMT. If you use such gasolines, your emission control system performance may deteriorate and the Malfunction Indicator Lamp on your instrument panel may turn on. If this happens, contact your authorized Honda dealer for service. (U.S. DX, HX, EX models, and Canadian DX and Si models) Use an unleaded gasoline with a pump octane number of 86 or higher. Use of a lower octane gasoline can cause a persistent, heavy metallic rapping noise in the engine that can lead to mechanical damage. (U.S. Si model and Canadian SiR model) Use a premium unleaded gasoline with a pump octane number of 91 or higher. If you are unable to find premium unleaded gasoline, you may substitute an unleaded regular gasoline. The engine will compensate for the lower octane, but you may notice a slight decrease in power as a result. Before Driving