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I've never taken an engine apart that didn't have oil residue (wet or dry) in the intake. In fact, when I just did my M104, there was actually a small pool of oily goo collected in the bottom half (aluminum) of the intake manifold. It wasn't much (perhaps a couple of teaspoons or tablespoons) but it was clear that this was crankcase blowby oil and fumes that had collected over a long period of time. I didn't let it bother me, and there was no evidence of any issue with crankcase ventilation. It's the nature of the beast.
You can clearly see the "moisture" in both my M117 and M104 (along with the small pool of blowby oil/goo in one M104 photo).
Again, what I see in your photos is totally normal for an engine with some miles on it.
Cheers,
Gerry
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