You can achieve this by adding a decent check valve into the system though.

Ive seen some extremely oily intake tracts.Р”Р„lso removing the potential for boost to leak into the crankcase is a big thing on the FSI platform. I do see the benefit in having a cleaner intake charge. Im not a huge believer in adding a catch can to keep intake valves clean. It would be interesting to monitor what the pressures are although as I understand it its not a huge amount. It ends up all being routed via the valve cover. Р”В®veryone that has said 'they have their theories' as to why they are a bad idea are probably too scared to be wrong.Р”В®ssentially the only difference between stock and having a catch can in the system I see is the removal of the valve that diverts crank case pressure either into the intake manifold or out the back of the valve cover. It was a simple solution for a simple engine. the breather was pretty much the engine filler and it had a rubber hose going into the oil bath air cleaner and another steel pipe pointing to the ground, if you do a bit of engine work you had a breather box set-up with 2 hoses coming from the rocker covers into the breather box which would have baffles or foam etc in it. It was common place to see an EH holden with visable fumes coming out of this pipe indicating engine wear.Р”В¬hrisIm way under 50 and know all about this owning an old beetle in the early 90s and driving it daily until 2002 when the VR6 took over the driving duties. if you get say a cup of goop every 500ks then start to get more there is internal wear in your engine.Р”В¬ars built in the 60's did not have catch cans or any sort of PCV there was just a pipe that ran from the rocker cover down the side of the engine on to the road. There something I should point out and only guys over 50 will know this.Р”Р„ catch can installed from new can be a good indication as to the condition of your engine.

How to install oil catch can vr6