The oil that you are seeing in the turbo intake boot is coming from the crank case ventilation system out of the drivers side valve cover and is normal. What you need to do is clean all the oil out that you can and then watch it. There is a possibility that the oil is coming from one of the high pressure oil plugs that go into the heads on the valley side of them. Occasionally one of the O rings will go bad and will start to seep oil out of the fitting.
96 F250 PS XLT 4X4 long box, 5sp,4.10, manual hubs,pyro+boost guages, Dark Toumaline, add a leaf, Dale's TYMAR, and HX hose, downpipe, coolant filter, Luk clutch