2009 Dodge Ram 1500 Pickup Owner Manual - Page 388

386 STARTING AND OPERATING The tire pressure sensors are covered under one of the 5.7L Engine The 5.7L engine is designed to meet all following licenses: emissions regulations and provide satisfactory fuel economy and performance when United States ...KR5S120123 using high quality unleaded gasoline havCanada ...2671-S120123 ing an octane range of 87 to 89. The manuFUEL REQUIREMENTS facturer recommends the use of 89 octane for optimum performance. The use of premium gasoline 3.7L and 4.7L Engine is not recommended, as it will not provide any benefit All engines (except 5.7L engines) are deover regular gasoline in these engines. signed to meet all emissions regulations and provide excellent fuel economy and performance when using high quality unleaded "regular" gasoline having an octane rating of 87. The use of premium gasoline is not recommended, as it will not provide any benefit over regular gasoline in these engines. Light spark knock at low engine speeds is not harmful to your engine. However, continued heavy spark knock at high speeds can cause damage and immediate service is required. Poor quality gasoline can cause problems such as hard starting, stalling, and hesitations. If you experience these symptoms, try another brand of gasoline before considering service for the vehicle.