It was my understanding that the oil used for vehicle fuel and the oil used for plastic isn't even the same stuff. And that part of the refinement process for

It was my understanding that the oil used for vehicle fuel and the oil used for plastic isn't even the same stuff. And that part of the refinement process for crude is to separate this out. IIRC heating oil is a more-direct competitor for the particular type of oil that is used in plastics.