Technician A says oil in the PCV filter and air cleaner can occur if the PCV valve is restricted or plugged. Technician B says oil buildup inside the throttle body can be an indication of high crankcase pressure. Who is correct?

Question

Quizplus · Accepted Answer

Both Technician A and Technician B are correct. A restricted or plugged PCV (Positive Crankcase Ventilation) valve can cause oil to enter the PCV filter and air cleaner, while oil buildup inside the throttle body can indicate high crankcase pressure, which is often a result of issues with the PCV system.

Technician a Says Oil in the PCV Filter and Air