The charged air pipe has fresh air only in it. No exhaust.
With a perfect turbo, it would have no oil at all.
A little bit of oil seepage is not unusual, but dripping oil would be bad.
If the oil dripped out, then I would concur with your conclusion that the turbo oil seals are failing
Whilst you have the inlet system apart, clean all pipework as best you can to get rid of the oil.
Even the intercooler, if possible.
It would also be worth removing the EGR valve and inlet pipes post EGR to the inlet system and giving that a clean out as well. If the engine has a few miles under it's belt, the inlet system post EGR may have some coke in it.
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XC90 R-Design MY2009, Black Sapphire Metallic. HP-Sound, RSE, Nav, Tel, ParkingCam, BLIS, ParkingHeater, RestHeat, Removable Towbar, Summer: CRATUS 20x8 on Pirelli Scorpion Zeros 255/45, Winter: NEPTUNE 17x7 on Continental WinterContact 4x4 235/65.
Last edited by SwissXC90; Jul 7th, 2020 at 08:36.
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