Actually there is a way to check. From the intake tube to the turbo housing and it you see/feel an oily film in there and feel oil dripping from the return tube going to the CCV, change it asap and clean everthing.

What can be done to prevent oil from ever getting into the turbo, do what I did for my other engines (which I will do for the dodge soon), install an oil separator/trap. Nothing more than a simple canister that the CCV hose goes into one side and the other side goes back to the turbo. Since oil is heavy, it will collect in the canister and stick to the bottom, but the air will go on ..... On one my engines, I collect quite a bit that would have gone through the turbo and intercooler.

More important thing, once oil gets into the intercooler, its performance drops. You do not want that to happen ! It is expensive to get a shop to boil them clean, repaint, and reinstall. Not to mention the pain you have to remove it and put it back plus down time.

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