The shelf life of olive oil largely depends on its type and how it is stored. Generally, unopened olive oil can last between 12 to 24 months. Extra virgin olive oil, which is less processed and retains more of the olive's natural flavors, typically lasts 12 to 18 months once opened. After opening, it’s best to consume it within six months for optimal taste and health benefits (Healthline).

Type of Olive Oil: Extra virgin olive oil has a shorter shelf life compared to refined olive oils due to its higher acidity and lower processing.
Storage Conditions: Olive oil should be kept in a cool, dark place. Exposure to heat, light, and air can accelerate the oxidation process, leading to rancidity (Brightland).

Yes, olive oil can go bad, but it may not always be obvious at first glance. While it doesn’t spoil in the same way perishable foods do, it can become rancid. Rancid olive oil loses its flavor and nutritional benefits but is generally not harmful to consume (Food Network).

To determine if your olive oil has gone bad, consider the following:

Smell: Fresh olive oil has a fruity aroma. If it smells waxy or reminiscent of crayons, it’s likely rancid (Brightland).
Taste: A small taste can reveal whether the oil is still good. Rancid olive oil will taste bitter, sour, or stale, lacking the peppery notes of fresh oil (Healthline).
Appearance: While olive oil may become cloudy when stored in the fridge, this does not indicate spoilage. Cloudiness is a normal reaction to cold temperatures (Brightland).

To extend the shelf life of your olive oil, follow these storage tips:

Cool, Dark Place: Store olive oil in a pantry or cupboard away from heat sources like the stove and direct sunlight.
Use Dark Glass Containers: Dark glass or tin containers help protect the oil from light, which can degrade its quality (Healthline).
Avoid Plastic: If possible, transfer oil from plastic containers to glass or tin to prevent any plastic taste from leaching into the oil (Brightland).
Seal Tightly: Always ensure the bottle is tightly sealed after use to minimize exposure to air.

In summary, olive oil does have an expiration date, with a typical shelf life of 12 to 24 months, depending on the type and storage conditions. While it may not spoil in a traditional sense, it can go rancid, affecting both flavor and nutritional benefits. By following proper storage practices and being aware of the signs of rancidity, you can enjoy your olive oil at its best. Remember, for the freshest taste and health benefits, it’s ideal to consume olive oil within six months of opening.