Ling Du 1.4t Why is there oil in this position of throttle and turbocharger?

The oil comes from the supercharger, and the exhaust gas driven turbine of the exhaust gas turbocharger is directly connected with the fresh air compression pump wheel through a shaft. During turbine operation, the rotating speed of this shaft can reach tens of thousands of revolutions per minute, so to ensure that this shaft is fully lubricated at all times, the whole shaft can be suspended in the oil-filled shaft hole at the highest, so all exhaust gas turbocharging will make the fit gap between the shaft and the shaft hole larger. When the gap is large, it is inevitable to leak oil. The leaked oil enters the engine through this pressurized air duct and is burned. So why do all turbocharged engines burn oil? So this is normal, as long as the leakage is not too much and the fuel consumption is not too serious, there will be no problem.