How long does cooking oil last?

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Different cooking oils stay fresh for different amounts of time, but you must treat them all well. They should be tightly covered and stored in the dark away from the heat (especially not in that handy cupboard over the stove). The less access they have to the air, the fresher they will stay. Refrigeration benefits most oils.

If unopened, peanut oil and corn oil and other vegetable oils will keep for at least a year. Once opened, they’re good for four to six months. But peanut oil, like olive oil, which is high in monounsaturates, benefits more from storage in the refrigerator. Olive oil will keep for about 6 months in the cool, dark pantry, but up to a year in the refrigerator. It may become cloudy and thicken up in the cold, in which case, letting it warm to room temperature will restore its pouring capacity. Walnut oil and sesame oil are delicate and inclined toward turning rancid. Kept in the refrigerator, they will stay fresh for two to four months.


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  • all_waysapril answered 6 years ago
    Cooking oil goes rancid quite easily, unless it is olive oil which has a pretty good shelf life. Some tips are, if you can, refrigerate it and just keep a smaller portion of it out. Keep in a tinted glass jar as light will destroy it and don't keep it near the stove as heat isn't god for it either. You'll know when it's gone rancid. Put a bit of it on your tongue. If it kind of tingles and burns a bit, it's rancid,
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  • Darla answered 6 years ago
    just to add to first answer, you can smell and taste if the oil isn't good anymore.
    know how your oils smell and taste while they are fresh so you can tell when they're turning, it's subtle but noticeable.
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  • Joanne A. answered 6 years ago
    We use liquid Crisco and put it in the fridge.
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