I wasn't sure if adding a pcv would have been enough venting for the crankcase pressure, that's why I never added one after I bought it. This is why I was looking into a vacuum pump to help relieve any crankcase pressure. I have seen vacuum pump regulators to help control the amount of vacuum applied to the engine. I've just always heard mixed reviews about street use and that's why I was kind of hesitant on adding one. I'm just willing to try anything to fix the oil leak since the car isn't even drivable with how bad it is and I think I've narrowed my issue down to excess pressure in the engine.