Im making the assumption they use oil to aid assembly of the parts, as a bit of oil there, wont affect the turbo. A ****** to pull off, so pretty snug fit.
If it's anything like my Astra VXR then there is a crankcase breather fed into the inlet pipework. This takes oil vapour into the inlet causing the oil you see. If there's loads of it there could be slightly too much crankcase pressure (too much/wrong grade of oil?) but it's deffo not anything to worry about.
Does anyone make them with the centre section in carbon, that would finish it off.
As above on the oil, normal due to crankcase breather which is fed back into the intake pipework for reduced emissions, on older cars they used to vent to air.
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