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I'd 1st then remove the high pressure intake hose after the turbo and have a feel of the turbine wheel - there should be no play radially at all - but a little bit of axial / end to end float is normal
also check inside the pipework for oil deposits as a worn turbo can lose oil through its shaft seal
which then gets drawn into the engine
and also check the oil feed pipe to the turbo ( on the top ) and the drain pipe back to the sump on the bottom
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