A turbomachine comprising: a housing 2 defining a bearing cavity 8 and a chamber separated by a first wall; a shaft 7 rotatable about an axis in the bearing cavity 8 and extending through an opening 13 in the first wall, the shaft 7 being mounted for rotation on a bearing assembly 10 provided in the bearing cavity 8; an oil sealing arrangement 30 for displacing oil away from the shaft 7 as the oil sealing arrangement 30 rotates thereby restricting the flow of oil to the opening 13; the oil sealing arrangement 30 comprising an oil diffuser device 31 defining an oil passage 39 disposed between opposed surfaces 41, 40 of the bearing assembly and the first wall, the passage 39 being configured for guiding and diffusing oil flow towards an outlet 50, the passage 39 extending outwardly of the axis and having a radially inner first portion that extends in a first direction with a dominant radial component and a second portion outboard of the radially inner portion and extending in a second direction with a greater axial component than the first direction; wherein the oil diffuser device 31 comprises a fixed member 38 that is designed not to rotate with the shaft 7 and defines a first surface 41, and a rotatable member 37 for rotation with the shaft 7 and that defines a second surface 40, the first and second surfaces 41, 40 facing each other and defining the diffuser passage 39 between them; and wherein the first and second surfaces 40, 41 are spaced apart such that, as the shaft 7 rotates, oil flows along the passage 39 as a body in contact with the first and second surfaces 40, 41 and decelerates such that gravitational and surface tension forces dominate and cause the oil to pour from the outlet 50 of the passage 39. a housing 2 defining a bearing cavity 8 and a chamber separated by a first wall; a shaft 7 rotatable about an axis in the bearing cavity 8 and extending through an opening 13 in the first wall, the shaft 7 being mounted for rotation on a bearing assembly 10 provided in the bearing cavity 8; an oil sealing arrangement 30 for displacing oil away from the shaft 7 as the oil sealing arrangement 30 rotates thereby restricting the flow of oil to the opening 13; the oil sealing arrangement 30 comprising an oil diffuser device 31 defining an oil passage 39 disposed between opposed surfaces 41, 40 of the bearing assembly and the first wall, the passage 39 being configured for guiding and diffusing oil flow towards an outlet 50, the passage 39 extending outwardly of the axis and having a radially inner first portion that extends in a first direction with a dominant radial component and a second portion outboard of the radially inner portion and extending in a second direction with a greater axial component than the first direction; wherein the oil diffuser device 31 comprises a fixed member 38 that is designed not to rotate with the shaft 7 and defines a first surface 41, and a rotatable member 37 for rotation with the shaft 7 and that defines a second surface 40, the first and second surfaces 41, 40 facing each other and defining the diffuser passage 39 between them; and wherein the first and second surfaces 40, 41 are spaced apart such that, as the shaft 7 rotates, oil flows along the passage 39 as a body in contact with the first and second surfaces 40, 41 and decelerates such that gravitational and surface tension forces dominate and cause the oil to pour from the outlet 50 of the passage 39.