A propeller drive assembly for transferring a torque between an engine and at least one propeller of a water surface vessel, - the propeller drive assembly comprising a plurality of lubrication clients, wherein the propeller drive assembly further comprises - a first lubrication system arranged to house a first lubricant, dedicated for lubrication of at least one first (531, 533, 534, 535, 536) of the lubrication clients, and wherein the propeller drive assembly comprises a first propeller shaft for supporting a first propeller, and a second propeller shaft for supporting a second propeller, the second propeller shaft being tubular and coaxial with the first propeller shaft, the first propeller shaft being arranged at least partly inside the second propeller shaft, wherein the propeller drive assembly further comprises a driveshaft extending in a non-zero angle to the first and second propeller shafts (511, 512), and being arranged to drive the first and second propeller shafts (511, 512), - wherein engagements between the driveshaft and the propeller shafts are served by the first lubricant, - wherein the propeller drive assembly comprises a second lubrication system arranged to house a second lubricant, dedicated for lubrication of at least one second of the lubrication clients (521, 522, 532), - the at least one second lubrication client comprising a seal (521, 522) arranged to seal the second lubrication system from a body of water surrounding at least a portion of the propeller drive assembly, the second lubrication system being arranged to transport the second lubricant to the seal (521, 522), - wherein the first and second lubrication systems are arranged so that the first and second lubricants are kept separate, wherein the second lubrication system presents a bore in the first propeller shaft for the transport of the second lubricant from a first side of the driveshaft in a direction towards a second side of the driveshaft, opposite to the first side, said seal (521, 522) being located on said second side of the driveshaft. - the propeller drive assembly comprising a plurality of lubrication clients, wherein the propeller drive assembly further comprises - a first lubrication system arranged to house a first lubricant, dedicated for lubrication of at least one first (531, 533, 534, 535, 536) of the lubrication clients, and wherein the propeller drive assembly comprises a first propeller shaft for supporting a first propeller, and a second propeller shaft for supporting a second propeller, the second propeller shaft being tubular and coaxial with the first propeller shaft, the first propeller shaft being arranged at least partly inside the second propeller shaft, wherein the propeller drive assembly further comprises a driveshaft extending in a non-zero angle to the first and second propeller shafts (511, 512), and being arranged to drive the first and second propeller shafts (511, 512), - wherein engagements between the driveshaft and the propeller shafts are served by the first lubricant, - wherein the propeller drive assembly comprises a second lubrication system arranged to house a second lubricant, dedicated for lubrication of at least one second of the lubrication clients (521, 522, 532), - the at least one second lubrication client comprising a seal (521, 522) arranged to seal the second lubrication system from a body of water surrounding at least a portion of the propeller drive assembly, the second lubrication system being arranged to transport the second lubricant to the seal (521, 522), - wherein the first and second lubrication systems are arranged so that the first and second lubricants are kept separate, wherein the second lubrication system presents a bore in the first propeller shaft for the transport of the second lubricant from a first side of the driveshaft in a direction towards a second side of the driveshaft, opposite to the first side, said seal (521, 522) being located on said second side of the driveshaft.