Heres what you need to know. The PCV (positive crankcase ventilation) valve is a one-way valve that recycles crankcase gases ...

The positive crankcase ventilation valve releases exhaust gas and unburned fuel from the engine block into the intake manifold. All engines allow some exhaust gases, unburned fuel and oil to ...

“Blowby-liquid from the positive crankcase ventilation system may collect on the intake air hose. If this occurs, then this ...

“As engine technology and fuel technology have evolved, the environment in the crankcase has changed,” says Stede Granger, Shell Lubricants. Twenty-five years ago, fuel sulfur levels hovered ...