Should there be oil in the PCV valve?

Yes, some oil can be present in the PCV (Positive Crankcase Ventilation) valve system, as it helps to lubricate the valve and facilitate the flow of gases. However, excessive amounts of oil may indicate issues such as a malfunctioning PCV system or engine problems, like excessive blow-by or worn piston rings. It's important to monitor the amount of oil in the PCV valve and address any abnormalities to maintain optimal engine performance.