2012 Dodge Challenger Owner Manual SRT8 - Page 332

330 STARTING AND OPERATING The TPM sensors are regulated under one of the follow- Light spark knock at low engine speeds is not harmful to ing licenses: your engine. However, continued heavy spark knock at high speeds can cause damage and immediate service is United States ...MRXC4W4MA4 required. Poor quality gasoline can cause problems such Canada ...2546A-C4W4MA4 as hard starting, stalling, and hesitations. If you experience these symptoms, try another brand of gasoline FUEL REQUIREMENTS before considering service for the vehicle. 6.4L Engine The 6.4L engine is designed to meet all emissions regulations and provide excellent fuel economy and performance when using high-quality premium unleaded gasoline with an octane rating of 91 or higher. 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 gasolines that meet the WWFC specifications if they are available.