2006 Honda Accord Owner's Manual - Page 151

Break-in Period, Fuel Recommendation Break-in Period Help assure your vehicle'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. Do not change the oil until the scheduled maintenance time. Avoid hard braking for the first 200 miles (300 km). Do not tow a trailer. You should also follow these recommendations with an overhauled or exchanged engine, or when the brakes are replaced. Fuel Recommendation Your vehicle is designed to operate on unleaded gasoline with a pump octane number of 87 or higher. Use of a lower octane gasoline can cause a persistent, heavy, metallic rapping noise that can lead to engine damage. For vehicles with manual transmission We recommend quality gasoline containing detergent additives that help prevent fuel system and engine deposits. In addition, in order to maintain good performance, fuel economy, and emissions control, we strongly recommend, in areas where it is available, the use of gasoline that does NOT contain manganese-based fuel additives such as MMT. You may hear a knocking noise from the engine if you drive the vehicle at low engine speed (below about 1,000 rpm) in a higher gear. To stop this, raise the engine speed by shifting to a lower gear. 154