2013 Chrysler 300 Owner Manual - Page 444

442 STARTING AND OPERATING an octane range of 87 to 89. The manufacturer recommends the use of 89 octane for optimum performance. The use of premium gasoline is not recommended, as it will not provide any benefit over regular gasoline in these engines. 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 imLight spark knock at low engine speeds is not harmful to prove air quality. your engine. However, continued heavy spark knock at The manufacturer supports the use of reformulated gasohigh speeds can cause damage and immediate service is lines. Properly blended reformulated gasolines will prorequired. Poor quality gasoline can cause problems such vide excellent performance and durability of engine and as hard starting, stalling, and hesitations. If you experi- fuel system components. ence these symptoms, try another brand of gasoline Gasoline/Oxygenate Blends before considering service for the vehicle. Over 40 auto manufacturers worldwide have issued and Some fuel suppliers blend unleaded gasoline with oxyendorsed consistent gasoline specifications (the World- genates such as Ethanol. Fuels blended with oxygenates wide Fuel Charter, WWFC) which define fuel properties may be used in your vehicle. necessary to deliver enhanced emissions, performance, and durability for your vehicle. The manufacturer recommends the use of gasolines that meet the WWFC specifications if they are available.