Air Oil Separators

About

Prevent oil mist from contaminating your intake tract, protect fuel octane levels, and maintain optimal combustion efficiency with replacement and performance oil separators. During normal engine operation, blow-by gases escaping past piston rings sweep oil vapors into the PCV (Positive Crankcase Ventilation) system. Left unchecked, this oil coats intake manifolds, fouls intake valves, degrades intercooler cooling efficiency, and lowers effective fuel octane—leading to performance-robbing knock and carbon buildup. Unlike traditional oil catch cans that store captured fluid in a reservoir requiring periodic manual draining, air-oil separators (AOS) continuously filter oil mist out of crankcase gases and automatically route the reclaimed oil back into the engine oil pan. Whether you're servicing a failing factory PCV oil separator assembly on a daily driver, installing a heated multi-stage air-oil separator on a high-boost forced induction street or track build, or protecting a heavy-duty diesel engine under extreme towing loads, maintaining clean crankcase ventilation is critical. Explore direct-fit air-oil separator kits, OEM replacement oil separator plates, heated swirl-pot separators, and drain-back mounting hardware engineered to keep your intake system clean and operating at peak power.