Abstract: Apparatus for treating crankcase vapor emissions of internal combustion engines, particularly automotive engines, interposed between the engine crankcase, ventilation port and the air-fuel intake manifold. The apparatus, including a separator-collector housing with header-cover mounted thereon, is adapted to receive the crankcase emissions (including engine blow-by gases) through the header-cover and an elongated inlet conduit depending downwardly therefrom and to direct such emissions into a lower sludge collection chamber of the housing. A filter assembly is carried by the inlet conduit and spans the separator-collector housing intermediate the bottom of the housing and the header-cover thereby defining in the lower portion of the housing the sludge collection chamber and defining in the upper portion of the housing a recycle vapor chamber.