2015 Jeep Grand Cherokee Owner Manual SRT - Page 474

472 STARTING AND OPERATING The TPM sensors are regulated under one of the follow- as hard starting, stalling, and hesitations. If you experience these symptoms, try another brand of gasoline ing licenses: before considering service for the vehicle. United States MRXMERCTX1 Over 40 auto manufacturers worldwide have issued and Canada 2546A-MERCTX1 endorsed consistent gasoline specifications (the WorldFUEL REQUIREMENTS wide Fuel Charter, WWFC) which define fuel properties necessary to deliver enhanced emissions, performance, 6.4L Engine and durability for your vehicle. The manufacturer recommends the use of gasolines that meet the WWFC speciThe 6.4L engine is designed to meet all emis- fications if they are available. sions regulations and provide excellent fuel Reformulated Gasoline economy and performance when using highquality premium unleaded gasoline with an Many areas of the country require the use of cleaner burning gasoline referred to as "Reformulated Gasoline." octane rating of 91 or higher. Reformulated gasoline contain oxygenates and are speLight spark knock at low engine speeds is not harmful to cifically blended to reduce vehicle emissions and imyour engine. However, continued heavy spark knock at prove air quality. high speeds can cause damage and immediate service is required. Poor quality gasoline can cause problems such