Australia: Time to act on olive oil
Every so often a laboratory quietly buys ‘extra virgin’ olive oil off the supermarket shelf, tests it, and finds a surprising share of famous imported brands failing the grade. This is not a scandal that erupts and passes — it is a permanent feature of the trade. Here is why, and how you protect yourself.
The story repeats around the world with the regularity of a season. An industry body or a government lab pulls bottles of ‘extra virgin’ from ordinary shop shelves, sends them for analysis, and reports that a meaningful number — often skewed toward big imported names — do not meet the extra-virgin standard they advertise. Sometimes the oil is stale; sometimes it is a lower grade sold up; sometimes it is cut with something cheaper. The details vary; the pattern does not.
Why ‘extra virgin’ is so easy to fake
Extra virgin is a strict standard — unrefined juice, below a low acidity limit, with no sensory defects — but it is invisible to the shopper. You cannot see freshness through green glass, and most buyers have never tasted a reference oil to compare against. That gap between a demanding standard and an unaware customer is exactly where fraud lives. A refined oil deodorised to hide its faults, or a tired oil past its best, can sit on the shelf looking identical to the real thing and cost a great deal less to make. Read the fuller anatomy in extra virgin that isn’t.
How testing actually catches it
Genuine grading uses two tools together. Chemistry measures acidity, peroxide value and other markers, and can flag oils cut or refined in ways the label denies. But chemistry alone is not enough, which is why a trained sensory panel tastes the oil blind — extra virgin must be free of defects like rancidity, mustiness or a fusty, winey off-note, and those are judged by the human palate. An oil can pass on paper and still fail in the mouth. It is the combination that has teeth.
Why local oil often wins these tests
There is a recurring, unsurprising result in these surveys: oil produced close to where it is sold tends to do well, while oil that has been shipped, stored and blended across long supply chains tends to struggle. It is not national pride; it is freshness and traceability. A short chain from a named grower to a nearby shelf gives the oil less time and fewer hands in which to degrade or be tampered with. That is the real argument for buying traceable, single-origin oil — not patriotism, but a shorter road.
| The grade | Extra virgin — unrefined, low acidity, no defects |
|---|---|
| The gap | Strict standard, invisible to the shopper |
| Common failures | Stale oil, lower grade sold up, adulteration |
| Chemistry checks | Acidity, peroxide value, purity markers |
| Sensory checks | Blind panel for rancid, musty, fusty defects |
| Why local scores | Fresher, shorter chain, more traceable |
| Your defence | Harvest date, real origin, taste for the burn |
How to buy around the problem
- Look for a harvest date, not just a distant ‘best before’ — freshness is the first casualty.
- Demand a real origin: a named country, region or estate beats a vague blend.
- Taste for the peppery burn at the back of the throat — the sign of living, healthy oil.
- Be suspicious of a famous name sold cheap; genuine extra virgin has a floor cost.
- Favour fresh, local or short-chain oil where you can — it consistently tests better.
Olive-oil authenticity: common questions
Why do imported ‘extra virgin’ oils fail tests?
Often because they are stale, a lower grade sold up, or cut with cheaper oil — the strict extra-virgin standard is invisible to shoppers, which makes it easy to fake.
How is olive oil graded?
By chemistry — acidity, peroxide value and purity markers — plus a blind sensory panel that checks for defects like rancidity and mustiness. Both together.
Can an oil pass chemistry but still fail?
Yes. Some faults are only detectable by taste, which is why a trained sensory panel is part of proper grading.
Why does local oil often score better?
Freshness and traceability. A short chain from a named grower to a nearby shelf leaves less time and fewer hands for the oil to degrade or be tampered with.
How do I avoid buying a fake?
Check for a harvest date and a real origin, taste for the peppery burn, and distrust a famous name that is suspiciously cheap.
These testing scandals are not really news; they are the trade showing its underside on a regular schedule. The lesson is not to panic about every import, but to stop buying blind. The shopper’s disadvantage is simple: you cannot taste through the glass and you have no reference oil in your head. Fix that. Buy one genuinely fresh, single-origin oil, learn its fruity-bitter-peppery signature, and every flat, greasy, nameless bottle afterwards will give itself away.
Drawn from recurring supermarket-sampling surveys of extra-virgin olive oil and standard chemical and sensory grading methods.