Where does the oil go in the turbo supercharger 99 buick park avenue?

My buick is making a whining noise and i was told the turbo supercharger needs oil. I donot see where to put the oil and what kind of oil should be used.? Please help me with this problem i never knew my turbo needed oil my car has on 50,000 miles on it.Can a turbo go out so soon.?|||you dont put oil in the turbo , it is oiled from the engine there is a oil pressure line going in to the turbo and a drain coming out