<VV> Turbo leaking oil

[James Cuneo]

Hi all,First post here.I have had three turbos leak oil from the the turbine split ring seal.All were rebuilt with new seals and different center housings.When disassembled the rings appear normal, unbroken or damaged.The oil leaks into the turbine housing, past the gasket, overflows the v-band clamp and then drips onto the turbine inlet flange causing smoke and fumes.Thanks for the help.Jim C65 corsa 140 with turbo