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Both current exhaust emission legislations and continuously growing customer demand of less oil consumption drive the diesel engine manufacturers to develop more efficient crankcase ventilation and oil mist separation systems. In recent years, integrated design concepts are also considered for almost all sub-systems to achieve compact solutions fulfilling the tightened packaging requirements and more challenging cost targets. This paper presents crankcase ventilation and oil mist separator unit of new generation Ford Otosan Ecotorq Heavy Duty Diesel engines and all work to reach its final configuration, the three-layer filter element with an integrated impactor design. The unit has a compact design as it is integrated to engine valve cover.