Owl noise from Turbos?
 

Ok I've been doing some research on the horrific noises my car has been making. My turbos on my T6 have always spooled a little on the loud side. As of 3 days ago, between 1500 and 2grand the spooling noise turns into a screeching owl/police siren. And gets even more odd as you accelerate. The car seems to be running just fine, no misses or anything of that nature. The turbo is however spitting oil all over my hood but it's been doing this since I bought the car 3 years ago. Anyone have any possibilities of what the problem with them might be? And also how difficult turbo removal is and if its possible to do it without lifting the engine? All help is appreciated thank you!