With my 1.3 MultiJet Euro5 engine nearing 150,000 km, the… — @emnkr

With my 1.3 MultiJet Euro5 engine nearing 150,000 km, the crankcase ventilation system started sweating where it exits the air filter housing and connects to the turbo intake hose. It wasn't there about 2,000 km ago. Does anyone have knowledge or experience on this? What could be causing it? What can we check?