High Quality Content by WIKIPEDIA articles! The BMW N57 is a family of aluminium, turbocharged straight-6 common rail diesel engines. The engines utilize variable geometry turbochargers. Engines use SIEMENS Piezo Injector. BMW N57, BMW, BMW M57, Straight-6, Diesel engine, Variable geometry turbocharger, Siemens, BMW F01, BMW 7-Series, BMW E90, BMW 3-Series, BMW 5 series, List of BMW engines