FAQ on EVOO: Why It Stings, Why It's Cloudy, How Long It Lasts, and Why It Costs

1On Taste

Why does the oil sting in the throat?

The stinging sensation is caused by oleocanthal, a polyphenol present almost exclusively in high-quality extra virgin olive oil. It is not a defect — it is one of the best indicators of freshness and quality. The more it stings, the more oleocanthal is present, and the healthier your oil is.

Why is the oil bitter?

Bitterness is caused primarily by oleuropein and its derivatives. Like the stinging sensation, it is a positive attribute: it indicates a high content of polyphenols. A flat, sweet oil is almost always of lower quality.

My oil no longer stings — has it gone bad?

Not necessarily gone bad, but it has lost a large part of its polyphenols. These degrade over time, especially if the oil has been exposed to light, heat, or oxygen. The flat taste means the health benefits are reduced, but the oil might still be perfectly fine for cooking if it does not smell or taste rancid.

2On Appearance

Why has my oil become cloudy?

If it is an unfiltered new season oil (novello), cloudiness is completely normal — these are suspended micro-particles of olive pulp. They will settle at the bottom over time.

If it is a filtered oil that has become cloudy or solidified, it has likely undergone partial crystallization of waxes and saturated fats due to low temperatures (< 10°C). Bringing it back to room temperature will melt the crystals and return it to a clear state — without any damage to quality.

Can the color of the oil indicate quality?

No. The color varies from deep green to golden yellow depending on the cultivar, the ripening stage of the olives, and the filtration method. A green oil is not necessarily better than a golden one.

3On Storage

Where should I keep the oil in the kitchen?

Away from heat sources (like the stovetop), in the dark, and closed tightly. Keeping the oil bottle on the counter next to the stove is the most common mistake. Instead: use a small opaque ceramic cruet for daily use and store the main supply in a dark, cool pantry or cellar.

How long can I keep the oil open?

Ideally 60–90 days from opening to enjoy its best qualities. After 3 months in normal kitchen conditions, the oil remains edible but will have lost its aromatic intensity and a significant part of its anti-oxidants.

4On Price

Why does artisanal EVOO cost so much?

Because producing it genuinely costs a lot. For each liter of oil, 5 to 10 kg of olives are needed, harvested by hand or with mechanical shakers (never from the ground). Add to this: labor, milling costs, bottling, logistics, and taxes. Under 10–12€ per liter, it is mathematically impossible to produce true quality Italian EVOO.