I have been thinking about this for a few days and thought I would put it out there.
Out of all the people that have had turbos fail be it standard LET or LEH what oil have you been using up-to the point it failed? And is there any pattern to it?
Maybe if we put a list of turbo owners oil use-age we might be able to see if there is any pattern to it. Just a thought. Might come to nothing though LOL
Mine has been using vaux 10-40 since new and its on 65k now and have never had one fail.