Lubrication Of Turbocharger
The turbocharger is lubricated by engine oil branched out from the oil pump. To cope with very high speed of the turbocharger turbine and the compressor shaft which may reach a maximum of several hundred thousands of rpm, full-floating type bearings are used which can form adequate oil films on their inside and outside during running.
Further the oil supplied to the turbocharger also plays a role of cooling the turbine so that heat from exhaust gas does not transmit to the bearings.