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 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 , and being arranged to drive the first and second propeller shafts , - 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 , - the at least one second lubrication client comprising a seal 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 , - 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 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 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 , and being arranged to drive the first and second propeller shafts , - 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 , - the at least one second lubrication client comprising a seal 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 , - 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 being located on said second side of the driveshaft. <EOS>