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BMW
Mini
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- Emissions System
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The OEM BMW plastic PCV valve can struggle to maintain pressure, even when brand new. A leaky PCV valve allows turbocharged pressures to escape into the crankcase, especially during boosted conditions. The extent of the leak depends on the PCV valve's condition, and additional issues like a cracked or loose valve cover or a faulty gasket can compound the problem, leading to oil loss and excessive crankcase pressure.