BMW M56

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The BMW M56 is a 2.5-liter 184-PS (135 kW; 181 bhp) straight-six engine. It is a re-engineered version of the BMW M54B25 engine, manufactured in order to meet SULV regulations in US states until 2006. The M56 was replaced by the BMW N54, which was BMW's first mass-produced turbocharged petrol engine.