An assembly (200, 2800), comprising: a turbocharger center housing (280, 580, 680, 780, 880, 980, 1080, 2810) comprising a through bore that extends between a compressor end and a turbine end of the turbocharger center housing, wherein the through bore comprises a sleeve mating surface and lubricant distribution features (686, 688, 985, 987, 1085, 1087, 1118, 1128, 1138, 1580, 1582) machined into the turbocharger center housing; and a sleeve (300, 510, 610, 710, 810, 910, 1010, 1210, 2830) positioned at least in part in the through bore of the turbocharger center housing via an interference fit, wherein the sleeve comprises: an outer mating surface, an inner compressor side bearing lubricant film formation surface disposed at a first radius, an inner turbine side bearing lubricant film formation surface disposed at a second radius, radial grooves (2842, 2844), wherein one of the radial grooves is disposed adjacent to the inner compressor side lubricant film formation surface and wherein another one of the radial grooves is disposed adjacent to the inner turbine side lubricant film formation surface, a surface between the inner compressor side bearing lubricant film formation surface and the inner turbine side bearing lubricant film formation surface that comprises a third radius that is less than the first radius and less than the second radius, a compressor side lubricant passage that extends between the outer mating surface and the radial groove disposed adjacent to the inner compressor bearing lubricant film formation surface of the sleeve, a turbine side lubricant passage that extends between the outer mating surface and the radial groove disposed adjacent to the inner turbine bearing lubricant film formation surface of the sleeve, wherein the outer mating surface of the sleeve contacts the sleeve mating surface of the turbocharger center housing via the interference fit to seal about junctures of the lubricant distribution features and the sleeve such that lubricant flows predominantly radially to each of the radial grooves of the sleeve respectively via the compressor side lubricant passage of the sleeve and the turbine side lubricant passage of the sleeve. a turbocharger center housing (280, 580, 680, 780, 880, 980, 1080, 2810) comprising a through bore that extends between a compressor end and a turbine end of the turbocharger center housing, wherein the through bore comprises a sleeve mating surface and lubricant distribution features (686, 688, 985, 987, 1085, 1087, 1118, 1128, 1138, 1580, 1582) machined into the turbocharger center housing; and a sleeve (300, 510, 610, 710, 810, 910, 1010, 1210, 2830) positioned at least in part in the through bore of the turbocharger center housing via an interference fit, wherein the sleeve comprises: an outer mating surface, an inner compressor side bearing lubricant film formation surface disposed at a first radius, an inner turbine side bearing lubricant film formation surface disposed at a second radius, radial grooves (2842, 2844), wherein one of the radial grooves is disposed adjacent to the inner compressor side lubricant film formation surface and wherein another one of the radial grooves is disposed adjacent to the inner turbine side lubricant film formation surface, a surface between the inner compressor side bearing lubricant film formation surface and the inner turbine side bearing lubricant film formation surface that comprises a third radius that is less than the first radius and less than the second radius, a compressor side lubricant passage that extends between the outer mating surface and the radial groove disposed adjacent to the inner compressor bearing lubricant film formation surface of the sleeve, a turbine side lubricant passage that extends between the outer mating surface and the radial groove disposed adjacent to the inner turbine bearing lubricant film formation surface of the sleeve, an outer mating surface, an inner compressor side bearing lubricant film formation surface disposed at a first radius, an inner turbine side bearing lubricant film formation surface disposed at a second radius, radial grooves (2842, 2844), wherein one of the radial grooves is disposed adjacent to the inner compressor side lubricant film formation surface and wherein another one of the radial grooves is disposed adjacent to the inner turbine side lubricant film formation surface, a surface between the inner compressor side bearing lubricant film formation surface and the inner turbine side bearing lubricant film formation surface that comprises a third radius that is less than the first radius and less than the second radius, a compressor side lubricant passage that extends between the outer mating surface and the radial groove disposed adjacent to the inner compressor bearing lubricant film formation surface of the sleeve, a turbine side lubricant passage that extends between the outer mating surface and the radial groove disposed adjacent to the inner turbine bearing lubricant film formation surface of the sleeve, wherein the outer mating surface of the sleeve contacts the sleeve mating surface of the turbocharger center housing via the interference fit to seal about junctures of the lubricant distribution features and the sleeve such that lubricant flows predominantly radially to each of the radial grooves of the sleeve respectively via the compressor side lubricant passage of the sleeve and the turbine side lubricant passage of the sleeve.