We have our theories, but no scientific evidence. Oil has healing properties, that has been passed on orally or documented, for centuries. Oil therapy is very big in Ayurvedic medicine, and has been for 5,000+ years. And oil is used in a huge variety of cultures for many cures.
The only Doctor that scientifically studied this is Russian....do you know Russian? Nothing is in English on Dr. Karach's study.
So, this is not at all surprising to those who are avid students of natural healing.
But the cool thing about this forum is that we've taken oil, and the discussion of oil to a whole other level. Topical, ingestion, properties of....you name it. There is a wealth of information about oil on this forum, if you have a spare 1,000 hours or so.