Believe the I'm leaking oil from the compressor side of my '89 T2 turbo. Oil in upper/lower intercooler hoses and air box hose. PCV system disconnected from air box to rule out oil coming from the valve cover.

Turbo was a used unit bought from a reputable board member. Little shaft play. Why is it leaking oil/how to confirm oil source?

Oil drain is using silicone hose, no sealer used on drain tube gasket. Drain appears clear and free of obstructions.

Sorry for potato quality cell phone pictures.

Hose going from air box to turbo air inlet:

https://i.imgur.com/yb5YHhB.jpg

Lower intercooler:



Upper intercooler hose:




Thanks for any/all input