I'm probably the last person you would want to ask about computer related stuffs. It took me days to figure out how to get photobucket to work. I'm still not really sure exactly why it wasn't working before, but won't press the question since it's working now.
Yes, you have found the banjo bolt. If you remove it, clean it well before removing, and remember to reassemble with 2 NEW copper washer-seals. While some may re-use these, it usually involves over-torquing the bolt to get them to seal properly again. It's better just to replace, even though they tend to be more expensive than one would expect a copper crush-washer to cost.
If it is the banjo fitting that's leaking, it's a fairly slow leak, as it would appear there isn't enough to clean the metal surrounding, as one would expect engine oil to do.
BoarX wrote:
I have taken off the top CAC hose and it feels like an oil-soaked sponge, apparently delivering oil not just to the turbo area, but also onto radiator/intercooler/whatever-it-is from its other end. Replacement ordered.
This is a condition that would explain both the oily wetness at the banjo fitting, as well as that forward from there, and above the compressor attachment flange.
This is where the oil dye could be helpful, if you clean and dry it thoroughly (brake or carb cleaner spray works well, but not indoors or while smoking). Check the clamps and attachments and ccv fittings making sure they are all clean and tight first.
I do suspect though, that replacing the CAC hose and clean-air intake duct, will take care of the leak in that general area, but will be even more able to fill the CAC with oil until you get your Provent installed.