Changing oil has proven to cause different reactions. Olive Oil changed the color of some peoples teeth. Coconut Oil for a long time was hailed as the king of teeth whiteners. I have no idea which oil might be stronger than others, and there has been many discussions about oils that react with different blood types, etc.
I wasn't aware of that. I have use Olive, Sesame, Grapeseed, and Coconut oils, and the only difference I have seen is in the taste. I have used Sesame the most though. Blood type "A"