An internal combustion engine with a turbocharger system , said turbocharger system comprising a turbocharger apparatus operatively connected with the engine ; said turbocharger apparatus comprising: an elongated center housing having a hollow central bore formed therethrough, and having first, second and third oil routing channels formed therein, a turbine member comprising a shaft portion extending through the central bore of the elongated center housing , said turbine member having an intake turbine attached to a first end of the shaft portion , and an exhaust turbine attached to a second end of the shaft portion ; a first bearing assembly and second bearing assembly , each operatively supporting said turbine member ; said first and second bearing assemblies are axially separated from each other; said first bearing assembly connected to a first oil routing channel , and said second bearing assembly connected to a second oil routing channel ; an electronic control unit ; a first oil circuit (P1) connected to said third oil routing channel , and operable to provide oil to the turbocharger apparatus at a first pressure level; a second oil circuit (P2) connected to each of said first and second oil routing channels , and operable to provide oil at a second pressure level which is one of same or different from the first pressure level, wherein the second oil circuit (P2) is separate from the first oil circuit (P1); and a plurality of operational sensors mounted on the engine ; wherein during operation, said electronic control unit is operable to, separately and independently from the first oil circuit (P1), control and regulate operation of the second oil circuit (P2) based in part on the input received from the plurality of operational sensors mounted on the engine for variably and selectively controlling hydraulic pre-loading in order to achieve desired pre-loading of the first and second bearing assemblies . an elongated center housing having a hollow central bore formed therethrough, and having first, second and third oil routing channels formed therein, a turbine member comprising a shaft portion extending through the central bore of the elongated center housing , said turbine member having an intake turbine attached to a first end of the shaft portion , and an exhaust turbine attached to a second end of the shaft portion ; a first bearing assembly and second bearing assembly , each operatively supporting said turbine member ; said first and second bearing assemblies are axially separated from each other; said first bearing assembly connected to a first oil routing channel , and said second bearing assembly connected to a second oil routing channel ; an electronic control unit ; a first oil circuit (P1) connected to said third oil routing channel , and operable to provide oil to the turbocharger apparatus at a first pressure level; a second oil circuit (P2) connected to each of said first and second oil routing channels , and operable to provide oil at a second pressure level which is one of same or different from the first pressure level, wherein the second oil circuit (P2) is separate from the first oil circuit (P1); and a plurality of operational sensors mounted on the engine ; wherein during operation, said electronic control unit is operable to, separately and independently from the first oil circuit (P1), control and regulate operation of the second oil circuit (P2) based in part on the input received from the plurality of operational sensors mounted on the engine for variably and selectively controlling hydraulic pre-loading in order to achieve desired pre-loading of the first and second bearing assemblies . <EOS>