To rejoin and older post, I have found an alum. straight pcv type valve that will open with any suction, for an experiment as a evac line set up , thinking it will draw all the time. I have been running an oil intersceptor/collector w/ a site tube to see if any oil is getting thru my existing pcv set up and into the throttle body , hasn`t passed any yet. Dont know about wot tho.