if you have a turbo you need to get a Catchcan system on there FAST.you are do alot of harm..the sound your hearing is the pressure pushing back thru the oil gallies so as the oil is flowing back to the pan there is to much pressure coming up..you need to have someone look at it fast before you blow out your oilpan gasket and valvecover gasket..im guessing if no pcv box its a b18b block GET SOME ventilation on that