That's a good question.
reading some of the stuff in a search, it gets confusing as to what Wild Oregano Oil really is..
Is says below, it is extracted from wild Marjoram, when you read about Marjoram, is says it's from Thyme... hummm
Red oil of Thyme is frequently imported and sold under the name of oil of Origanum: it is often adulterated with oils of turpentine, spike lavender and rosemary, and coloured with alkanet root, and is not infrequently more or less destitute of Thymol. True oil of Origanum is extracted from Wild Marjoram, Origanum vulgare, and other species of Origanum.