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If the PCV system fails, severe sludge buildup and oil leaks can occur

Plugged PVC valve allowed moisture buildup resulting in sludge
A plugged PCV valve causes many other engine problems. Pressure begins to build, and gaskets and oil seals may fail. When an engine suffers multiple oil leaks, You should always inspect the PCV system. Another problem is a lack of air flow to carry vapors from the crankcase. Without air flow, moisture contamination remains, and a sludge buildup is often the result. Operating the engine without adequate ventilation is a leading cause of engine sludge.

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