I never said don't use it, but I promise you it won't do a thing. There is no effective means of separation buddy, just telling it like it is. That way of plumbing it in will just put a hell of a load of oil in the catch tank, taking it away from where it is useful!

See below, a breather with 4 ports, as the GGR setup;
http://shop.grahamgoode.com/3-port-o...86-66944-p.asp

Look at the diagram below it, that's how a 4 line should be wired up.