Plug-in pump for arrangement on an at least one- or two-stage transmission for driving a vehicle, wherein the plug-in pump is able to be flange-mounted on a housing (62, 64) of the transmission and, in this case, projects into the transmission housing (62, 64), wherein the plug-in pump is configured for supplying lubricating oil to at least one consumer, wherein the plug-in pump: comprises at least two pump suction stages (4, 6) for sucking in a lubricating oil from a first oil container, which functions as a dry sump, and for conveying the lubricating oil into a second oil container, which functions as an oil tank, and comprises at least two pump pressure stages (8, 10) for sucking in the lubricating oil from the second oil container and for conveyance to the consumer, wherein the pump suction stages (4, 6) and the pump pressure stages (8, 10) are arranged spaced apart from one another in a pump housing and have a common drive shaft, wherein the pump suction stages (4, 6) are formed by a first arrangement (ZA 1) of at least three external gears (12, 14, 16) which mesh with one another and which lie in a first plane, and wherein the pump pressure stages (8, 10) are formed by a second arrangement (ZA 2) of at least three external gears (18, 20, 22) which mesh with one another and which lie in a second plane, wherein the first plane and the second plane are parallel to one another, wherein at least two of the respective gear centre points (ZM 1, ZM 2, ZM 3) of the first external-gear arrangement (ZA 2) and at least two of the respective gear centre points (ZM 4, ZM 5, ZM 6) of the second external-gear arrangement (ZA 2) are arranged in a common plane (E - E) which intersects the pump housing in a longitudinal direction (X - X) and which, as such, is orthogonal to the first and second planes. comprises at least two pump suction stages (4, 6) for sucking in a lubricating oil from a first oil container, which functions as a dry sump, and for conveying the lubricating oil into a second oil container, which functions as an oil tank, and comprises at least two pump pressure stages (8, 10) for sucking in the lubricating oil from the second oil container and for conveyance to the consumer, wherein the pump suction stages (4, 6) and the pump pressure stages (8, 10) are arranged spaced apart from one another in a pump housing and have a common drive shaft, wherein the pump suction stages (4, 6) are formed by a first arrangement (ZA 1) of at least three external gears (12, 14, 16) which mesh with one another and which lie in a first plane, and wherein the pump pressure stages (8, 10) are formed by a second arrangement (ZA 2) of at least three external gears (18, 20, 22) which mesh with one another and which lie in a second plane, wherein the first plane and the second plane are parallel to one another, wherein at least two of the respective gear centre points (ZM 1, ZM 2, ZM 3) of the first external-gear arrangement (ZA 2) and at least two of the respective gear centre points (ZM 4, ZM 5, ZM 6) of the second external-gear arrangement (ZA 2) are arranged in a common plane (E - E) which intersects the pump housing in a longitudinal direction (X - X) and which, as such, is orthogonal to the first and second planes.