I did a home-made one years ago for my '97 VW Passat diesel because the EGR in that engine combined with the oil in the intake to crud up the intake manifold - once I took the manifold off and found the passages only about 3/4 inch in diameter with all the crud. I suspect you could make one just to try out with these engines. Just takes some long hose and a Y fitting and a plug for the bottom hose. I also stuffed some copper mesh (same stuff the BATF tried to make illegal
) inside so there was something for the oil mist to condense on). Try to make sure that doesn't get sucked into the engine though, heh.