I tracked my turbo oil leak by adding a bottle of UV dye after cleaning the engine bay with a pressure washer (after taking precautions by taping off all the electricals of course). Then with a UV light, I found the leak coming from the charge pipe connecting to the intercooler.
https://www.autozone.com/test-scan-a...B&gclsrc=aw.ds
Make sure the oil is relatively clean though. I did this initially after 7k on the oil and it was too dark for the UV dye to fluoresce. With a fresh oil change it worked like a charm.