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Stringent emission legislations increase the significance of emission reduction through crankcase ventilation systems in combustion engines. Oil mist separation efficiency of the CCV systems directly impacts the emissions of diesel engines. The CCV systems retain the oil with soot and carbon particles and return them to the oil sump. CCV thus reduces engine oil consumption and emissions. Contemporary technology enables usage of highly efficient CCV systems. However, the filtration efficiency of the CCV system is limited to keep crankcase pressure under limits. Oil particles which escape from CCV system result in soot deposit on turbocharger compressor leading to deterioration of turbocharger performance. Performance variation of turbocharger has a substantial impact on engine emissions. Therefore, it is essential to understand the effect of CCV system design and different engine operating conditions which accelerate the Oil mist deposits on turbocharger Compressor.