How long does vegetable oil last in the fridge?

In this brief article, we are going to answer the question, “How long does vegetable oil last in the fridge?”

How long does vegetable oil last in the fridge?

Vegetable oil that hasn’t been opened can last for up to 18 months in the fridge. Despite this, the date displayed on it is not the end of the validity period. In most cases, you’ll be able to make it last for a few months before quality starts to degrade. If you keep it in a cold, dark area, it can last for up to a year.

Depending on the source, the best-by date for opened cooking oil ranges from 3–5 months to just relying on the expiration date, regardless of when the container was opened.

You can extend the shelf life of your vegetable oil by refrigerating it after opening.

Vegetable oils are the general name for oils produced from plants for human consumption. Condiments, margarine, mayo, and cookies are just a few of the processed foods that include these preservatives. Soy-bean oil, sun-flower oil, olive-oil, and coconut-oil are common vegetable oils.

What are the signs that vegetable oil has gone bad?

Vegetable oil has a shelf life of 12 to 18 months, however it can become rancid within that time. In the same way that other fat-based products degrade, this one will eventually become unusable and unsafe to eat or drink.

Rancidification occurs faster once you’ve opened the container. How you keep it also has an impact.

Like some other oils, it is hard to predict how long a particular oil is going to be effective. So instead of depending on dates, it’s far preferable to evaluate the oil’s quality.

There are several ways to identify whether vegetable oil has gone rancid.

Spoilage Warning Signs

If the oil has an odor which reminds those of old paints or chemicals, it is rancid. It’s the same whether the stench is overpowering or off-putting in any manner. 

Because of their neutral flavor and aroma, vegetable oils may be used in a wide variety of prepared foods.

Mold or any other type of microbial growth has formed on or in the bottle’s cap. Mold isn’t always a symptom of spoiling, but if you see any, dispose of the oil.

You must be familiar with the appearance of vegetable oil. Consider it spoiled if anything is wrong with yours. However, cloudiness or crystallization is not a symptom of deterioration. If you keep the oil at a chilly temperature, this is typical; however, you may reverse the impact by removing the top and putting the bottle somewhere warmer.

It’s disgusting. The final check is to taste the oil whether it seems and smells fine. Sour, soapy or harsh in flavor are all signs that something has gone bad and is not safe to eat.

Even olive oil shows the same indicators of deterioration as canola or sunflower oil,  if you were wondering

Don’t waste your time with a bottle of olive oil that has been sitting about for months, even if it’s a fresh new bottle. It’s better to be on the safe side than on the wrong one.

What happens to vegetable oil when it’s used?

Air, light, and heat accelerate the rancidification process of the oil, and if you use the same oil several times it may be a terrible idea. 

To put it another way, a thirty minute cooking session can have as much of an impact on the oil as two months of it sitting open and exposed to air.

To top it all off, vegetable oils are a lot more likely to go rancid than saturated fats. Lard, as opposed to vegetable oil, is hence a better choice for recycling.

However, if you’d like to repurpose your cooking oil, keep the following in mind:

Try to use the oil to make similar dishes, or even the identical one, to get the best results. Because the oil absorbs the taste of the dish, if you use it to fry seafood it renders it practically indestructible for any other purpose.

Think about how “dirty” the food you’re preparing is before you start cooking. If the oil is used to fry pancakes rather than breaded meat, the final product will have a higher quality.

Using the oil considerably reduces its shelf life.

Fresh oil should never be mixed with old oil.


In this brief article, we answered the question, “How long does vegetable oil last in the fridge?”


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Hi, I am Charlotte, I love cooking and in my previous life, I was a chef. I bring some of my experience to the recipes on this hub and answer your food questions.