Oil pump guide rail drive chain kit designed for vehicles with N55B30A engine code.This kit includes components required for oil pump chain replacement and is intended for use with the N55 engine variant that requires a tensioner, OE number 11417618941.The set contains one oil pump guide rail assembly, three oil pump gears, one oil pump chain, and one tensioner.It is compatible with multiple models equipped with the N55 engine, including those designated with 235i, 335i, 435i, 535i, 640i, and 740i configurations, as well as X4, X5, and X6 variants within specified production years.Fitment covers various body styles such as coupe, convertible, saloon, estate, gran turismo, gran coupe, and models produced between 2006 and 2019.verification of your engine's oil chain configuration before installation, as the N55 engine uses two different oil chain kits—one with a tensioner and one without.This assembly is for the version that includes the tensioner.