A small about of oil in the pipework is normal. Small quantities of oil mist are expelled from the turbo oil seal. This gradually increases as the turbo sees more mileage.
I expect your inlet manifold is coked up with goop. This is a byproduct of the oil, after it is particularly burnt by the hot exhaust gas passing into the EGR valve. This clogs the inlet manifold, and makes it generally run badly.
Also the crank filter needs changing, as Arctic2 has said.