NBrehm· Premium Member
It could be the turbo, if oil is leaking into it it would certainly end up int the intake. If it was a piston or rings you would have a major drop in oil pressure so i doubt it is that. Oil pump shouldn't be an issue either since it doesn't connect to the intake. If your rings/pistons are good (assuming you have goof oil pressure) the only for oil to get into the intake in large quantities is the pcv system or a leak in the turbo.