It has been very cold around here lately, about -4℉. When I drove to work in the morning everything worked fine, but when I started it up at night it sounded like a diesel and the oil pressure light came on when I drive. It sounds like no oil is being pumped into the engine. It has lots of oil and no fault codes stored. Based on my research it seems like the PCV valve can freeze which would stop the flow of oil if I the car is not warmed up to temperature when parked. Does that seem like a plausible cause or am I going down a rabbit hole? Do I need a new PCV valve?