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#di #gdi #direct_injection #gasoline #problems #issues #diy #educations #cars #trucks #reviews #truth #carbon #cleanup #walnut #BG_Products #Bosch #carbon_deposits #intake_valves #cleaning #ecoboost #Audi #Earthdreams #BMW #VW #Hyundai #Mazda #skyactiv #Mercedes #fix #repairComments: