there is no pressure there unless you are buiding up crankcase pressure..
the oil basically falls out the bottom of the turboand runs back into the lifter valley
if you are getting crankcase pressure it should only be when under boost and better crankcase venting would help .
if you still have the stock oil fill cap you need to toss it and put in a open filter and plug off the hole in the plastic tube going to the t/b.