Hengst CCV Oil Separator System for BMW 3 Series E91 (2006-2012)

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BMWs oil separator and crankcase ventilation system is excellent at what it does when properly maintained. Always inspect any visible hoses when you are under the hood and follow the manufacturers replacement schedule.
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Oil Separator Valve
Oil Separator Valve
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T#:22064583
Part#: AS815M
Ships on Jul 27, 2026
$ 64.99 USD
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$ 64.99 USD
Free Shipping on orders $49 and up
Add to Wish List
BMW has an ongoing issue with oil separators freezing in cold weather if driving is done before the vehicle is fully warmed up. There is often a howling noise followed by numerous oil leaks. The crankcase breather valve is used to purge the oil vapor from the engine block into the valve cover. However, sometimes condensation can cause it to freeze, causing the entire oil separator system to fail, crack, and disintegrate.
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