Turbo leak oil and whistle?

Hello, i was looking for help i was told by the dealership because my turbos are whistling and will need to be replaced. I went back home with the car and decided to take intake off of driver side turbo and i can see oil in the turbo inlet itself as well at blown up into my intake. Took it to a different shop to get warranty work done and they are saying my turbos are fine when i went in and saw with my own eyes the oil in my intake and the turbos do whistle while accelerating. I’m really trying to find out if they really are fine or if I should take my car somewhere else as they cannot find problems.