Shane T. Hanson of Victoria Australia, attests that when he was indentured to a particular tradesman, a Joseph Lundthorp, who had been a Messerschmitt Bf 109 pilot, told him that because fuel and lubricant shortages were absolutely critical, human fat was used as the gearbox grease (engine to propeller) in the Bf 109's. He said it was not a particularly suitable lubricant for this application, but it was either getting a couple of hours out of the gear box or no flying time at all.