2013 Lincoln Navigator Owner Manual Printing 1 - Page 192

192 Fuel and Refueling It is best not to alternate repeatedly between gasoline and E85. If you do switch fuels, it is recommended that you add as much fuel as possible-at least half a tank. Do not add less than five gallons (18.9L) when refueling. You should drive the vehicle immediately after refueling for at least 5 miles (8 km) to allow the vehicle to adapt to the change in ethanol concentration. If you exclusively use E85 fuel, it is recommended to fill the fuel tank with regular unleaded gasoline at each scheduled oil change. Octane Recommendations "Regular" unleaded gasoline with a pump (R+M)/2 octane rating of 87 is recommended. Some stations offer fuels posted as "Regular" with (R+M)/2 METHOD an octane rating below 87, particularly in high altitude areas. Fuels with octane levels below 87 are not recommended. 87 Do not be concerned if your engine sometimes knocks lightly. However, if it knocks heavily under most driving conditions while you are using fuel with the recommended octane rating, see your authorized dealer to prevent any engine damage. RUNNING OUT OF FUEL Avoid running out of fuel because this situation may have an adverse effect on powertrain components. If you have run out of fuel: • You may need to cycle the ignition from off to on several times after refueling to allow the fuel system to pump the fuel from the tank to the engine. On restarting, cranking time will take a few seconds longer than normal. • Normally, adding 1 gallon (3.8L) of fuel is enough to restart the engine. If the vehicle is out of fuel and on a steep grade, more than 1 gallon (3.8L) may be required. • The service engine soon indicator may come on. For more information on the service engine soon indicator, refer to the Instrument Cluster chapter. See Settings in the Instrument Cluster chapter for information on calculating DTE (Distance to empty). 2013 Navigator (nav) Owners Guide gf, 1st Printing USA (fus)