You will always find some oil in the intercooler pipes as the crankcase is vented into the air intake, the turbo seals will allow oil in if leaking but at 100,000 miles it should be OK providing the oil has been changed regularly.
The black smoke will in all probability be air starvation, it may be because the intercooler is clogged or it could just be that the air filter needs changing. I the pump has been altered that could also account for black smoke along with improved performance.
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