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Still Using That Cooking Oil? Here’s How Long It Really Lasts After Opening
Cooking oil is a kitchen staple, but how often do we check if it’s still good to use? Many people assume that oil lasts forever, but in reality, once opened, its shelf life can be surprisingly short depending on the type and how it’s stored. Using expired or rancid oil can affect the taste of your dishes—and in some cases, even your health. Here’s a guide to understanding how long common cooking oils last after opening and tips to extend their freshness.
How Long Does Cooking Oil Really Last?
Different oils have different shelf lives due to their fat composition. Here’s a general guideline for opened oils:
| Type of Oil | Typical Shelf Life After Opening |
|---|---|
| Olive Oil (Extra Virgin) | 6–12 months |
| Vegetable Oil (Soybean, Canola) | 6–12 months |
| Coconut Oil | 12 months |
| Peanut Oil | 6–12 months |
| Sesame Oil | 6 months (strong aroma fades over time) |
| Sunflower Oil | 6–12 months |
Note: Oils stored improperly may go rancid faster.
Signs Your Cooking Oil Has Gone Bad
You don’t always need to rely on the expiration date—your senses can help you detect bad oil:
- Smell: Rancid oil has a sharp, sour, or unpleasant odor.
- Taste: If your oil tastes bitter or off, it’s time to replace it.
- Appearance: Cloudiness or separation in oils like olive oil can indicate spoilage.
- Texture: Some oils may become sticky or unusually thick when they turn bad.
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