2011 Dodge Ram 1500 Quad Cab Owner Manual - Page 437

436 STARTING AND OPERATING gasoline is not recommended, as it will not provide any as hard starting, stalling, and hesitations. If you experience these symptoms, try another brand of gasoline benefit over regular gasoline in these engines. before considering service for the vehicle. 5.7L Engine The 5.7L engine is designed to meet all Over 40 auto manufacturers worldwide have issued and emissions regulations and provide satisfac- endorsed consistent gasoline specifications (the Worldtory fuel economy and performance when wide Fuel Charter, WWFC) which define fuel properties using high quality unleaded gasoline hav- necessary to deliver enhanced emissions, performance, ing an octane range of 87 to 89. The manu- and durability for your vehicle. The manufacturer recomfacturer recommends the use of 89 octane mends the use of gasoline that meets the WWFC specifor optimum performance. The use of premium gasoline fications if they are available. is not recommended, as it will not provide any benefit Reformulated Gasoline over regular gasoline in these engines. Many areas of the country require the use of cleaner Light spark knock at low engine speeds is not harmful to burning gasoline referred to as "Reformulated Gasoline." your engine. However, continued heavy spark knock at Reformulated gasolines contain oxygenates and are spehigh speeds can cause damage and immediate service is cifically blended to reduce vehicle emissions and imrequired. Poor quality gasoline can cause problems such prove air quality.