But if it is opened, I personally suggest eating it within three months.
As long as it is unopened and oxidized, it can be eaten normally. I have a friend who works in the national oil storage industry. He once told me that the national oil storage has a cycle of almost 5 to 6 years. When the State Reserve sells these oils, various oil companies will produce various retail edible oil products.
Therefore, the shelf life of 18 months marked on the edible oil label does not mean that the oil is counted from the day it is produced. But from the day when the oil company packed it, maybe this oil has been put for several years.
Therefore, the shelf life of 18 months marked on edible oil is just a rigid requirement of the state for food safety. As long as it is unopened, not exposed to the sun, and isolated from the air, the edible oil stored at room temperature and away from light has no shelf life and can be eaten normally.
I used to be in a hotel, and the chef cooked the staff meal for us. Using expired oil. This kind of oil is cheap, and the quality will not be a big problem. It is possible that the peroxide value in oil will be high, but it will basically not cause any harm to people. After all, oil is still very expensive, so it would be a pity to dump it.
If it expires after opening, individuals are not advised to continue eating it. Ordinary edible oil is exposed to the sun, or exposed to air in a high temperature and high humidity environment, which is likely to produce oxidation and produce a very unpleasant smell. At this time, the oil will deteriorate, which is likely to produce some carcinogens.
Secondly, some dishes have peanut oil for a long time and will have a mustard taste. This is actually caused by the oxidation of phospholipids in edible oil, which not only loses flavor, but also produces some harmful substances.
Therefore, I personally suggest not to eat this oil. But there is a saying, even if this oil is expired, it is much cleaner and healthier than gutter oil. Although some of the indicators will be super high, in fact, China's national standard management of edible oil products is very strict, and the indicators are very low. So even if you accidentally eat some, you don't need to worry much.
In fact, even if the cooking oil is expired, there is no need to throw it away. It is still very useful.
For example, it can be used to make handmade soap, or fried soybeans to make flower fertilizer, which can be applied to keyhole and lock parts to prevent rust. It can be used to apply dry heels in winter to prevent skin cracking.
The cooking oil at home expired a few years ago, and my mother would never throw it away. Because she found that using cooking oil to maintain leather clothes, leather pants and leather shoes is much better than proper oil maintenance.