Vegas, First thing to do is make sure the PCV valve is functioning and the hose from the PCV to the manifold is not blocked or kinked. Also make sure tha if the PCV valve is in line in the hose that it is not intalled backwards. Air should flow from the valve cover to the vacuum source and not the other way. That pipe you mentioned is supposed to be a breather and the flow of air should be going from the air cleaner into the valve cover, not the other way around as you mentioned. The PCV hose should be providing vacuum from the manifold pulling out of the valve cover on the opposite side from the pipe are talking about. When everything is working right, vacuum from the manifold should be pulling air through the hose, through the PCV valve, through the valve cover and crankcase, then through the opposite valve cover and finally from your air cleaner housing. There should be a foam or fiber filter on the inside of your air cleaner where the pipe connects to it. Check to make sure that everything is clear in that circuit and it should stop your oil problem.

Hope this helps

Pat