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There must be a very bad seal between the compressor and oil supply.
It is normal for some compressor side liquid (including air as a liquid) to enter the oil supply, for example this is why Borg Warner Turbocharger engineers will say do NOT inject water/methanol pre-turbo (because it will mix with oil supply).
However there should be no detectable amount of flow (it should be so minimal that it isn't noticeable) where yours is clearly extremely BAD and you need a turbo rebuild/new turbo.
The minute you start to push pressure into the crankcase (from anywhere,really) the engine performance will dramatically suffer and oil will go pushing out all over everything.
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