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Along the oil's journey through the oil lube system, the oil lubricates, cools, removes impurities, supports load, and minimizes friction. At the end of the oil's journey it returns to the sump where it remains nearly motionless until it re-enters the oil pick-up and restarts its journey. This study is focused on the creation and destruction mechanisms of air in the oil. To study this, a motored Ford 3.OL V6 DOHC engine test apparatus was designed, fabricated and instrumented to operate at 8000rpm and at engine oil temperatures below 110 C. Visual observations and quantitative measurements of oil aeration were performed in the oil sump. The oil aeration process was visualized in the oil sump using high-speed video equipment, at engine speeds below 4000rpm. Oil droplets were observed to depart the crankshaft at approximately the tangential velocity, pass through drainage gaps in the windage tray, and strike the free surface of the oil. The rhythmic pulsation of oil droplets on the free surface caused the surface to slosh at the frequency of the crankshaft's rotation. Foam was observed to form above a threshold speed and a threshold temperature. The windage tray was observed to reduce the droplet number density. When the windage tray was removed, th