PCV Valve Oil Separator Catch Can

The primary function of an Air/Oil Separator (AOS) is to remove oil mist from the crankcase and head ventilation air, preventing it from being drawn into the intake system. This AOS features a unique design that allows you to retain your stock PCV valve while effectively separating oil. By keeping oil out of the intake, the engine can run more efficiently, leading to benefits such as reduced chances of engine knock (detonation), improved fuel octane, better emissions, and lower oil consumption. In typical GrimmSpeed fashion, this unit is compact, visually appealing, and packs a performance punch. Constructed from fully machined billet aluminum with a durable black or red anodized finish, this AOS is maintenance-free. Unlike mesh-media catch cans that can accumulate contaminants and sludge, the GrimmSpeed AOS coalesces oil without such media. The kit includes user-replaceable O-ring seals for longevity. If you have a built motor or are experiencing abnormal amounts of oil consumption, this kit may not be suitable for your needs. It is compatible with the following Subaru models: 2004-21 Subaru STI, 2002-07 Subaru WRX, 2004-08 Subaru Forester XT, and 2004-06 Subaru Baja XT.