Are you sure the source of the oil is the turbo? Take the inlet hose of the front of the turbo (the hose that comes from the air cleaner) and have a look inside the hose to see if the oil is coming from further up towards the air filter. If it is then the oil you are seeing is condensed PCV oil mist and you money would be better spent on a PCV filter or catch can. It's worth checking if you have not already.
Tony




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