2009 Dodge Dakota Owner Manual - Page 300

298 STARTING AND OPERATING Light spark knock at low engine speeds is not harmful to your engine. However, continued heavy spark knock at high speeds can cause damage and immediate service is required. Poor quality gasoline can cause problems such as hard starting, stalling, and hesitations. If you experience these symptoms, try another brand of gasoline before considering service for the vehicle. Over 40 auto manufacturers worldwide, have issued and endorsed consistent gasoline specifications (the Worldwide Fuel Charter, WWFC), which define fuel properties necessary to deliver enhanced emissions, performance, and durability for your vehicle. The manufacturer recommends the use of gasoline that meets the WWFC specifications, if they are available. Reformulated Gasoline Many areas of the country require the use of cleaner burning gasoline, referred to as "Reformulated Gasoline." Reformulated gasolines contain oxygenates, and are specifically blended to reduce vehicle emissions and improve air quality. We strongly support the use of reformulated gasolines. Properly-blended reformulated gasolines will provide excellent performance and durability for the engine and fuel system components. Gasoline/Oxygenate Blends Some fuel suppliers blend unleaded gasoline with oxygenates such as 10% ethanol, MTBE and ETBE. Oxygenates are required in some areas of the country, during the Winter months, to reduce carbon monoxide emissions. Fuels blended with these oxygenates may be used in your vehicle.