2014 Jeep Wrangler Owner Manual - Page 519

STARTING AND OPERATING 517 Over 40 auto manufacturers worldwide have issued and endorsed consistent gasoline specifications (the World3.6L Engine wide Fuel Charter, WWFC) which define fuel properties necessary to deliver enhanced emissions, performance, This engine is designed to meet all emis- and durability for your vehicle. The manufacturer recomsions regulations and provide excellent mends the use of gasolines that meet the WWFC specifuel economy and performance when us- fications if they are available. ing high-quality unleaded "regular" gasoReformulated Gasoline line having an octane rating of 87. The use of premium gasoline is not recommended, as it will not Many areas of the country require the use of cleaner provide any benefit over regular gasoline in these en- burning gasoline referred to as "Reformulated Gasoline". Reformulated gasolines contain oxygenates and are spegines. cifically 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 high speeds can cause damage and immediate service is The manufacturer supports the use of reformulated gasorequired. Poor quality gasoline can cause problems such lines. Properly blended reformulated gasolines will proas hard starting, stalling, and hesitations. If you experi- vide excellent performance and durability of engine and ence these symptoms, try another brand of gasoline fuel system components. before considering service for the vehicle. FUEL REQUIREMENTS 5