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This is considered the cold side, where the turbo is pressurizing the air from the intake. Turbo seals are allowing oil to pass from the CHRA or center section where the bearings wheel the housing. Basically this happens if you push the turbo too hard and cause the shaft to move thus compromising the oil seal. Or the turbo is old.

I had an Audi that leaked tons of oil. I had to pour out my intercooler boots and intercooler every now and then. Nothing awful, the motor will burn the little excess oil off in the cylinders. If you see smoke that resembles the color of burning oil or if you see oil in the tail pipe, you need to fix the problem. I would keep an eye on it. Just know that turbo will need a rebuild sooner or later.
 
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