Success Lubricating oil used in motors of aeroplanes designed for sub-stratosphere altitude operations must be charged with oxygen to prevent congealing temperatures of 20 degrees below zero. Here a sample of the pil is examined by scientists after the "ice box test. Oil in test tube still flows smoothly.It Runs .... Oil used in the engines of airplanes that are flown in the sub-stratosphere must be charged with oxygen to prevent congealing at temperatures below forty degrees below zero. Here a