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We're talking about a 6.5 diesel. There's no intercooler/aftercooler, just straight from the turbo into the intake. Nor would an intercooler ever have oil. The oil seal can fail in a turbo and introduce oil into the intake path leading to a runaway. But there's no oil at all in an intercooler.

Intercooler?

So just how much did you "turn it up"? You should have only needed 1/16-1/8 a turn without gauges. 1/4 to 3/8 if you have gauges and drive by them.