Abstract: A method is disclosed for controlling pollution emission of an internal combustion engine which method includes the steps of mixing gases exhausted from the engine combustion chambers with gases exhausted from the engine crankcase and then directing the mixed gases back to the combustion chambers. For practicing the method a pollution control device is also disclosed which included means for receiving and mixing together gases from an engine exhaust manifold and crankcase, and means for directing the mixed gases to engine combustion chambers.