414 TECHNICAL SPECIFICATIONSPoor quality gasoline can cause problems suchas hard starting, stalling, and hesitations. If youexperience these symptoms, try another brandof gasoline before considering service for thevehicle.5.7L EngineDo not use E-85 flex fuel or ethanol blendsgreater than 15% in this engine.This engine is designed to meet allemissions regulations and providesatisfactory fuel economy andperformance when using high-qualityunleaded gasoline having an octane range of87 to 89 as specified by the (R+M)/2 method.The use of89 octane “Plus” gasoline is recommended foroptimum performance and fuel economy.While operating on gasoline with an octanenumber of 87, hearing a light knocking soundfrom the engine is not a cause for concern.However, if the engine is heard making a heavyknocking sound, see your dealer immediately.Use of gasoline with an octane number lowerthan 87 can cause engine failure and may voidor not be covered by the New Vehicle LimitedWarranty.Poor quality gasoline can cause problems suchas hard starting, stalling, and hesitations. If youexperience these symptoms, try another brandof gasoline before considering service for thevehicle.Reformulated GasolineMany areas of the country require the use ofcleaner burning gasoline referred to as“Reformulated Gasoline”. Reformulatedgasoline contains oxygenates and arespecifically blended to reduce vehicleemissions and improve air quality.The use of reformulated gasoline isrecommended. Properly blended reformulatedgasoline will provide improved performanceand durability of engine and fuel systemcomponents.Materials Added To FuelBesides using unleaded gasoline with theproper octane rating, gasolines that containdetergents, corrosion and stability additives arerecommended. Using gasolines that have theseadditives will help improve fuel economy,reduce emissions, and maintain vehicleperformance.Designated TOP TIER DetergentGasoline contains a higher level ofdetergents to further aide inminimizing engine and fuel systemdeposits. When available, the usage of TOPTIER Detergent gasoline is recommended. Visitwww.toptiergas.com for a list of TOP TIERDetergent Gasoline Retailers.Indiscriminate use of fuel system cleaningagents should be avoided. Many of thesematerials intended for gum and varnishremoval may contain active solvents or similaringredients. These can harm fuel system gasketand diaphragm materials.
