A multidisk oil-bath clutch comprising: a housing mounted to rotate about a longitudinal axis of rotation; at least one hub mounted to rotate about the longitudinal axis of rotation and housed inside and coaxially with the housing; a number of drive disks housed inside the housing and angularly integral with the housing or the hub; a number of driven disks housed inside the housing, alternating with the drive disks, and angularly integral with the hub or the housing; at least one main oil inlet into the housing located axially at a first end of the housing; a number of secondary oil inlets located radially, are formed through a lateral surface of the hub, and are fed by a feed conduit formed axially through the hub; and at least one oil outlet from the housing; the oil-bath clutch being characterized in that: it is provided an on-off valve which is connected to secondary oil outlets, which prevents oil flow through the secondary oil outlets when the clutch is activated to transmit torque between the drive disks and the driven disks, and which permits oil flow through the secondary oil outlets when the clutch is released and no torque is transmitted between the drive disks and the driven disks; and the on-off valve comprises a number of shutters, each of which is located inside the housing, close to the lateral shell of the housing, has a number of through holes corresponding with respective secondary oil outlets, and is movable axially between an open position, in which each through hole in the shutter is aligned with a respective secondary oil outlet, and a closed position, in which each through hole in the shutter is out of line with respect to a respective secondary oil outlet. a housing mounted to rotate about a longitudinal axis of rotation; at least one hub mounted to rotate about the longitudinal axis of rotation and housed inside and coaxially with the housing; a number of drive disks housed inside the housing and angularly integral with the housing or the hub; a number of driven disks housed inside the housing, alternating with the drive disks, and angularly integral with the hub or the housing; at least one main oil inlet into the housing located axially at a first end of the housing; a number of secondary oil inlets located radially, are formed through a lateral surface of the hub, and are fed by a feed conduit formed axially through the hub; and at least one oil outlet from the housing; the oil-bath clutch being characterized in that: it is provided an on-off valve which is connected to secondary oil outlets, which prevents oil flow through the secondary oil outlets when the clutch is activated to transmit torque between the drive disks and the driven disks, and which permits oil flow through the secondary oil outlets when the clutch is released and no torque is transmitted between the drive disks and the driven disks; and the on-off valve comprises a number of shutters, each of which is located inside the housing, close to the lateral shell of the housing, has a number of through holes corresponding with respective secondary oil outlets, and is movable axially between an open position, in which each through hole in the shutter is aligned with a respective secondary oil outlet, and a closed position, in which each through hole in the shutter is out of line with respect to a respective secondary oil outlet. it is provided an on-off valve which is connected to secondary oil outlets, which prevents oil flow through the secondary oil outlets when the clutch is activated to transmit torque between the drive disks and the driven disks, and which permits oil flow through the secondary oil outlets when the clutch is released and no torque is transmitted between the drive disks and the driven disks; and the on-off valve comprises a number of shutters, each of which is located inside the housing, close to the lateral shell of the housing, has a number of through holes corresponding with respective secondary oil outlets, and is movable axially between an open position, in which each through hole in the shutter is aligned with a respective secondary oil outlet, and a closed position, in which each through hole in the shutter is out of line with respect to a respective secondary oil outlet.