Joe is correct, it really shouldnt matter what it is made out of as if it is making contact, its done for eventually. The oiling system of the 270 isnt allowing enough oil in the contact area and the thrust of the compressor wheel is splashing it out.
As far as differant turbos having 270s having no problems is probably the fact that they dont use garrett center sections that have a weak oiling system on there thrust plates.
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