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my 603
on my 603 in my 300D my charge air/crossover pipe was gunky with sludge at its connection to the air pipe comming from the turbo (see pik#1). the rest of my intake manifold was kinda coky/powdery/sooty black.
the way i see it, the only "normal" ways for oil vapor getting into the charge air and intake (leading to gunk) are from the EGR that dumps into it and the breather from the valve cover that scavenges vapors.
sorry i cant contribute anything usefull to the other questions,
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MIKE
1987 300D Turbo, 225K
124.133/603.960
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