A turbocharger for an engine system, comprising: a compressor housing including a compressor inlet and a compressor outlet; a turbine housing including a turbine inlet, a turbine wheel and a turbine outlet; a center housing connected between the compressor housing and the turbine housing; and a shaft supported in the center housing, the shaft extending in a longitudinal direction of the turbocharger, wherein the turbine inlet includes a first mounting interface for connecting the turbocharger to an exhaust system of the engine system, wherein the turbine outlet includes a second mounting interface for connecting the turbocharger to an exhaust aftertreatment system (24, 25) of the engine system, wherein the center housing includes an oil outlet disposed below the shaft for draining lubricant from the same, characterized in that the first mounting interface faces in a first direction perpendicular to the longitudinal direction, the second mounting interface faces in a second direction that extends at a first predetermined angle (α) with respect to the plane defined by the longitudinal direction and the first direction, wherein a substantially plane mounting surface is provided around an oil outlet opening of the oil outlet, and a flange mounting portion configured for mounting a drain flange to the same, the flange mounting portion including a pair of mounting structures (82a, 82b) arranged opposite to each other on both sides of the oil outlet opening along a fourth direction, wherein the substantially plane mounting surface extends at a third predetermined angle (δ) with respect to the plane orthogonal to the first direction, and wherein the fourth direction extends at a fourth predetermined angle (ε) with respect to a center plane (p) of the center housing that is perpendicular to the longitudinal direction. a compressor housing including a compressor inlet and a compressor outlet; a turbine housing including a turbine inlet, a turbine wheel and a turbine outlet; a center housing connected between the compressor housing and the turbine housing; and a shaft supported in the center housing, the shaft extending in a longitudinal direction of the turbocharger, wherein the turbine inlet includes a first mounting interface for connecting the turbocharger to an exhaust system of the engine system, wherein the turbine outlet includes a second mounting interface for connecting the turbocharger to an exhaust aftertreatment system (24, 25) of the engine system, wherein the center housing includes an oil outlet disposed below the shaft for draining lubricant from the same, characterized in that the first mounting interface faces in a first direction perpendicular to the longitudinal direction, the second mounting interface faces in a second direction that extends at a first predetermined angle (α) with respect to the plane defined by the longitudinal direction and the first direction, wherein a substantially plane mounting surface is provided around an oil outlet opening of the oil outlet, and a flange mounting portion configured for mounting a drain flange to the same, the flange mounting portion including a pair of mounting structures (82a, 82b) arranged opposite to each other on both sides of the oil outlet opening along a fourth direction, wherein the substantially plane mounting surface extends at a third predetermined angle (δ) with respect to the plane orthogonal to the first direction, and wherein the fourth direction extends at a fourth predetermined angle (ε) with respect to a center plane (p) of the center housing that is perpendicular to the longitudinal direction.