You can't eat oil after three years. The shelf life of edible oil is 18 months, and it is difficult to keep fresh after opening. Therefore, it is necessary to pay attention to the shelf life, and expired oil or turbid, precipitated and odorous edible oil cannot be eaten. There will be a large number of bacteria breeding after food has expired edible oil, and harmful substances will increase due to moldy internal substances.

Edible oil, also known as "edible oil", refers to animals or vegetable oils used in the process of making food. In the cooking process, because fat permeates into the tissues of raw materials, it not only improves the flavor of dishes, but also supplements the nutritional components of some low-fat dishes, thus improving the calories of dishes, that is, the nutritional value.