[header] How to store cooking oil [title] Keep the cap or lid on the oil bottle when you are not using it. [step] One of the main causes of oil turning rancid is exposure to too much oxygen. When you are not using the oil, keep the cap or lid on the container. 
[title] Store the oil in a dark-colored glass bottle with a tight-fitting cap. [step] Even if the oil comes in a clear, glass bottle, consider transferring it to a blue or green one.