When UAV's must fly at certain altitudes and climates, engine oil can gas out and become difficult to pump within the engine system. In some cases; vapor bubbles froth out, inhibiting the critical flow of oil to the engine resulting in catastrophic engine issues during critical missions. By applying a predetermined and exact level of heat and vacuum to the engine oil directly before filling the UAV oil tank, with Battlefield’s deaerator, our customers are able to degas without damaging the critical chemical balance of the oil.