Habe heute endlich eine Antwort von PHR bekommen, die mich wieder glücklich stimmt.

Die kugelgelagerten Turbos haben tatsächlich soein grosses Spiel, welches so gross ist, dass wenn man es hochdrückt, die Kompressorschaufeln gegen das Gehäuse blocken.
The compressor wheels on these larger shaft turbos are designed to move around, its
normal.. Unless you see markings on the compressor housing where the fins are rubbing
against the housing, its perfectly normal. I can take a brand new one here and push the
shaft against the housing to stop the blades. But once there is oil pressure to the
turbo, there is no play when running.