A system for collecting lube oil in an internal combustion engine with a rotating crankshaft assembly reduces lube oil aeration. The system includes a primary separation chamber arranged above an oil sump; an air interchange zone arranged above the primary separation chamber; an entrance aperture fluidly coupling the air interchange zone to the primary separation chamber; an exit aperture laterally spaced from the entrance aperture and fluidly coupling the primary separation chamber to the air interchange zone and for guiding air arising from the motion of the rotating crankshaft assembly from the primary separation chamber to the air interchange zone; and a main oil accumulation plate extending from the entrance aperture to the exit aperture and separating the primary separation chamber and the air interchange zone. The system further features a primary oil accumulation plate located above the exit aperture, extending towards the main oil accumulation plate at a first angle, and defining an airflow control aperture between the main oil accumulation plate and the primary oil accumulation plate through which fluids from the exit aperture are directed.