There are two things happening here (one is expected, the other not).
First, oil is being vaporised in the crankcase and is passing up through the PCV. In the second photo, it's the hose just to the right of dead centre of the photo, partly wrapped in ribbed aluminium. This hose goes from the top of the camshaft cover to the air intake just before the turbocharger. Oil and exhaust gas (the result of blow-by) are drawn out of the engine into the suction side of the turbocharger, pumped through into the pressure side. This is a normal and expected operation. The oil is passed into the intake manifold (where it unfortunately combines with EGR soot and forms a black gunk) and is then combusted by the engine.
The amount of blowby (and oil vapour) increases with age as the cylinder bores and piston rings wear. This can be reduced by fitting a catch can in that PCV hose. Catch cans provide place for the oil to condense and must be emptied on a regular basis (either back into the sump, which is acceptable, or disposed of appropriately).
Second - the hoses on the high pressure side of the turbocharger (anything between the turbocharger and the intake manifold) are aging and have split and/or have come loose. Although typical boost levels in a D40 rarely exceed 20psi (and atmospheric pressure is 14.7psi), it's still enough to force air out of the joins/cracks.
If you remove the clamps around the affected area you'll be able to examine the hoses. Flexing them should reveal cracks and splits. Silicone hose replacements are good, be careful about adding too much hard pipe (if you decide to go that way) because the hoses are there to allow the engine to move (the intercooler doesn't move).
While you're replacing hoses, you might want to pop that intercooler out and clean it. I used ordinary unleaded fuel in mine, poured about 100ml in and let it run back and forth while I turned the intercooler to let the fuel pass through as many of the cores as possible. On the fifth rinse the fuel started coming out reddish again. The intercooler comes out the front, pop the grille out, remove the two bolts at the top of the intercooler and the two hose clamps (the one on the right hand side of the vehicle is a bugger to get to).
