In my situation the leak(s) were all coming down over and around the oil filter housing area, I was convinced that the filter housing was leaking, but a dye test confirmed it was not and the parts I mentioned were leaking. Unfortunately there are many cheap plastic vent and vacuum lines on these BMW's, in fairness my Mini, Porsche(s) and Mercede(s) have all had very similar cheap lines with the same results.
The Right Side Fuel Tank Ventilation Valve was below the right Turbo (number 2 in attachment):
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