A crankshaft and conrod assembly comprising a crankshaft and a conrod, wherein the crankshaft comprises at least one main journal and one crankpin journal, and the at least one conrod is provided upon the crankpin journal, and the crankshaft is provided with an oil supply structure for supplying the crankpin journal with lubrication oil and the conrod with an oil pressure, wherein the oil supply structure comprises: an oil supply conduit provided between the main journal and the crankpin journal (112, at least a first oil supply opening and a second oil supply opening are provided at the crankpin journal, and a connection point where the oil supply conduit connects to the first and second oil supply openings (114, 115), wherein the conrod is arranged upon the crank pin journal through a bearing sleeve, at which at least a first oil groove and a second oil groove are provided in a circumferential direction at an inner surface of the bearing sleeve, wherein the first oil supply opening is provided at a first radial distance from a rotational axis of the crankshaft, the second oil supply opening is provided at a second radial distance from the rotational axis and both the first and second radial distance (D1, D2) are larger than or equal to the distance between the connection point and the rotational axis of the crankshaft, wherein an angle between the first and second oil supply openings (114, 115) is larger than an angle (B1, B2) between opposing end portions (152_1, 153_1) of the two oil grooves (152, 153) and the angle between the first and second oil supply openings (114, 115) is larger than the angular distance of at least one of the oil grooves (152, 153) and wherein at least a third oil supply opening is provided in between the first and second oil supply openings (114, 115). an oil supply conduit provided between the main journal and the crankpin journal (112, at least a first oil supply opening and a second oil supply opening are provided at the crankpin journal, and a connection point where the oil supply conduit connects to the first and second oil supply openings (114, 115), wherein the conrod is arranged upon the crank pin journal through a bearing sleeve, at which at least a first oil groove and a second oil groove are provided in a circumferential direction at an inner surface of the bearing sleeve, wherein the first oil supply opening is provided at a first radial distance from a rotational axis of the crankshaft, the second oil supply opening is provided at a second radial distance from the rotational axis and both the first and second radial distance (D1, D2) are larger than or equal to the distance between the connection point and the rotational axis of the crankshaft, wherein an angle between the first and second oil supply openings (114, 115) is larger than an angle (B1, B2) between opposing end portions (152_1, 153_1) of the two oil grooves (152, 153) and the angle between the first and second oil supply openings (114, 115) is larger than the angular distance of at least one of the oil grooves (152, 153) and wherein at least a third oil supply opening is provided in between the first and second oil supply openings (114, 115).