Killer B Motorsport Oil Control Valve | 2008-2014 Subaru WRX & 2008+ Subaru WRX / STI (OCV2)

Killer B Motorsports
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2008-2014 WRX/STI Oil Control Valve by Killer B Motorsport

The Subaru boxer platform can have issues with oil surging in the heads. This burden is often overwhelming to the PCV's A/O separator or Catch Can system causing them to fill. Filling an A/O separator or catch can causes oil levels to drop increasing the potential for oil starvation. Another condition is if a catch can fills, and overflows onto a hot engine and/or exhaust system creating a fire potential, which has been known you happen.

The Oil Control Valve prevents oil flow out of the valve cover ports based on the lateral forces placed on the car. This design has been successfully used in aerobatic aircraft for years and we have adapted the design to be suitable for lateral loading vs inverted flight (which rarely happens in cars).

Under straight line acceleration, braking and moderate cornering the PCV vents work just as they normally would; letting blow-by gasses vent from all ports. Under severe lateral loads the port from the surging head (facing the outside of a corner) is closed, not allowing oil to pass into the A/O or catch can setup. The balance ports and remaining head and crankcase ports still operate as normal. This has no negative effect on the engine or engine performance, while assuring blow-by gasses ONLY are permitted through the PCVs ports.


  • Prevents Oil Flow from Valve Cover Ports
  • Design Adapted from valves in Aerobatic Aircraft Vehicles
  • No Negative Impact on Vehicle Performance
  • Reduces Potential for Oil Starvation and Engine Fires


Attention! This is not a product that would EVER be needed on a street car.


  • 2008 - 2014 Subaru Impreza WRX
  • 2008+ Subaru WRX STi

What's In The Box?

  • 1 - Killer B Oil Control Valve
  • All Necessary Hardware
  • Instructions/Manuals
  • Warranty Information



All Killer B Motorsport products come with a limited lifetime warranty against manufacturing defects.

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