I noticed in all the pictures of people using cone filter set ups, they have the rubber tube from the valve cover going into an oil separator. I would prefer to just route it into the stock metal tube that comes from the oil pan and goes to the bottom of the stock air cleaner assembly.

Anyone see a problem with this?

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2012 Mercedes ML350 Bluetec 102K (hers)
2005 Corvette 55K (fun car)
2002 VW Jetta TDI 238K (mine)
1998 Volvo S70 T5 Turbo 211K (kids)
1994 Ford F150 4WD 246K (firewood hauler)
1983 Mercedes 300D 384K (diesel commuter)