The conventional turbocharger bearing system comprising of two fully-floating ring bearings lubricated by the main engine oil system has been very successful. It provides excellent damping against rotor motion, is tolerant of contaminants in the lubrication oil and is economic to manufacture. New materials and bearing technologies are becoming available and offer opportunities to reduce noise, improve efficiency and increase durability. Ball bearings and air bearings are likely to be used on some applications in the future.