A multidisk oil-bath clutch comprising: a housing mounted for rotation and having a longitudinal axis of rotation; at least one hub mounted for 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; at least one oil outlet from the housing; and a feed circuit for feeding pressurized oil to cool the disks (7, 8) and lubricate the rotating component parts through the housing from the inlet to the outlet, and in turn comprising: an oil tank; wherein the feed circuit comprises: a circulating pump that draws from the tank; a main conduit that connects the delivery of the circulating pump to the inlet of the housing and is always open; a bypass conduit which branches off from the main conduit, upstream from the inlet of the housing, and terminates in the oil tank; and a bypass valve for regulating oil flow along the bypass conduit and having the function of opening and closing the bypass conduit while always leaving the main conduit open; the oil-bath clutch being characterized in that: the feed circuit comprises an oil-cooling radiator in series with the circulating pump; and the bypass valve is controlled to close the bypass conduit when the clutch is activated to transmit torque between the drive disks and the driven disks, and to open the bypass conduit when the clutch is released and no torque is transmitted between the drive disks and the driven disks. a housing mounted for rotation and having a longitudinal axis of rotation; at least one hub mounted for 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; at least one oil outlet from the housing; and a feed circuit for feeding pressurized oil to cool the disks (7, 8) and lubricate the rotating component parts through the housing from the inlet to the outlet, and in turn comprising: an oil tank; wherein the feed circuit comprises: a circulating pump that draws from the tank; a main conduit that connects the delivery of the circulating pump to the inlet of the housing and is always open; a bypass conduit which branches off from the main conduit, upstream from the inlet of the housing, and terminates in the oil tank; and a bypass valve for regulating oil flow along the bypass conduit and having the function of opening and closing the bypass conduit while always leaving the main conduit open; the oil-bath clutch being characterized in that: the feed circuit comprises an oil-cooling radiator in series with the circulating pump; and the bypass valve is controlled to close the bypass conduit when the clutch is activated to transmit torque between the drive disks and the driven disks, and to open the bypass conduit when the clutch is released and no torque is transmitted between the drive disks and the driven disks. a circulating pump that draws from the tank; a main conduit that connects the delivery of the circulating pump to the inlet of the housing and is always open; a bypass conduit which branches off from the main conduit, upstream from the inlet of the housing, and terminates in the oil tank; and a bypass valve for regulating oil flow along the bypass conduit and having the function of opening and closing the bypass conduit while always leaving the main conduit open; the oil-bath clutch being characterized in that: the feed circuit comprises an oil-cooling radiator in series with the circulating pump; and the bypass valve is controlled to close the bypass conduit when the clutch is activated to transmit torque between the drive disks and the driven disks, and to open the bypass conduit when the clutch is released and no torque is transmitted between the drive disks and the driven disks. the feed circuit comprises an oil-cooling radiator in series with the circulating pump; and the bypass valve is controlled to close the bypass conduit when the clutch is activated to transmit torque between the drive disks and the driven disks, and to open the bypass conduit when the clutch is released and no torque is transmitted between the drive disks and the driven disks.