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I’m by no means anywhere near a turbo expert but that play looks alamingly excessive to me. The turbo is a very precise thing and what looks like a good couple of mm lateral movement can’t be right can it? As there is an oil feed to it I would guess you’ve found the problem yourself. Oil could be passing the seals on the turbine shaft. Do you get blueish coloured smoke out the exhaust?
As for the crankcase breather if that’s what you mean by breather. My cars the same age as yours and when I first bought it it was one of the first things I went to service as I know they get overlooked. I had an E39 530d which has the same engine years ago and swapped the ‘bog roll’ filter for the later vortex type. On opening the lid on my E92 I found it empty!! I googled this and came to the conclusion these later M57’s didn’t have any sort of filter/diaphragm at all, just an empty housing.
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