If you did an engine swap, you know how to use PBblaster and take the turbo off. Not a difficult job. What is surprising is that the turbo itself has failed. The new, modern units are normally quite good and not failure prone like the 740 version.

Turbos can be re-sealed on your work bench. All you need to know is the size of the turbo. Only if the bearings on the center vane are shot is the turbo dead, and then it should make a lot of noise.

A little oil in the intake is normal. Oil getting past the oil return line and leaking down the engine is an easy fix. A new blow off valve or anything external is easy to do. The only real maintenance is to keep the PTC nipple clean so that the crankcase pressure remains negative at all times.

Klaus
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Always willing to listen, just not able to take direction.