Some level of oil is quite normal in the pipes. The engine re-circulates crankcase gases to improve emissions. This leaves some residual oil mist within the piping. Excess oil, puddles - 1/4 litre or so in intercoolers, would indicate a loose engine, that may be suffering blow by. It could also be oil from the turbochargers oil seals, on the past old turbo.
How has the turbo been playing up?