Abstract: An oil pan for internal combustion engines having a piston--piston rod--crankshaft assembly effecting "splash" lubrication and having a pressurized engine lubrication system. The oil pan substantially reduces unnecessary "splash" and thus increases engine efficiency. The oil pan has a main sump disposed below the bottom wall of the pan for containing oil. There is a side sump disposed in one side wall of the oil pan and in fluid flow communication with the main sump. An elongated windage tray, semi-circular in cross-section, is provided and is positioned longitudinally in the oil pan adjacent the side sump with the convex side down and is spaced above the pan bottom wall. A coacting elongated skimmer bar is positioned above and spaced from an upper edge of the tray adjacent and slightly above the side sump for channeling oil skimmed off the tray into the side sump and then into the main sump in controlled flow.