2010 Lincoln MKT Owner's Manual - Page 398

Maintenance and Specifications Octane recommendations 3.7L V6 engine Your vehicle will run normally on 87 octane regular fuel. Premium fuel will provide improved performance. 3.5L V6 EcoBoost engine Your vehicle is designed to run on regular fuel with an octane rating of 87 or higher. For best overall performance, premium fuel with an octane rating of 91 or higher is recommended. The performance gained by using premium fuel will be most noticeable in hot weather or in severe duty applications such as towing a trailer. Some stations offer fuels posted as Regular with an octane rating below 87, particularly in high altitude areas. Fuels with octane (R+M)/2 METHOD levels below 87 are not recommended for either engine. Do not be concerned if your engine sometimes knocks lightly. However, if it knocks heavily while you are using fuel with the recommended octane rating, see your authorized dealer to prevent any engine damage. 87 Fuel quality If you are experiencing starting, rough idle or hesitation driveability problems, try a different brand of unleaded gasoline. If the problems persist, see your authorized dealer. Do not add aftermarket fuel additive products to your fuel tank. It should not be necessary to add any aftermarket products to your fuel tank if you continue to use high quality fuel of the recommended octane rating. These products have not been approved for your engine and could cause damage to the fuel system. Repairs to correct the effects of using an aftermarket product in your fuel may not be covered by your warranty. Many of the world's automakers approved the World-Wide Fuel Charter that recommends gasoline specifications to provide improved performance and emission control system protection for your vehicle. Gasolines that meet the World-Wide Fuel Charter should be used when available. Ask your fuel supplier about gasolines that meet the World-Wide Fuel Charter. 398 2010 MKT (mkt) Owners Guide, 3rd Printing USA (fus)