If you’ve got 20 minutes there’s a great in depth video on YouTube (https://youtu.be/9oK6MBYGpb8). The video gets a lot of it’s information from the book ‘Extra Virginity’.
tl:dr It’s just grading. Extra virgin oil has the fewest undesirable qualities, followed by virgin, then refined oils. You could extract it any which way, but you’re most likely to get high grade oil from certain methods, so people tend to equate extra virgin to cold pressed and all. But it’s just a grade.
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