Spoiled Rotten Oils - Pure Organic Essential Oil - Mayans Secret News. In general, don’t keep them more than 3 years. Older oils are more likely to be spoiled because of exposure to oxygen. They may not work as well and could irritate your skin or cause an allergic reaction. If you see a big change in the way an oil looks, feels, or smells, you should throw it out, because it has probably spoiled.
