Is every citrus oil pressed, or some distilled?

it's all pressed, you squeeze the peel and the oil sprays out. you're overthinking it

Not all of them. The club's Class on how fragrance is extracted says lime oil is usually steam distilled, while bergamot, grapefruit and lemon are pressed. Neroli and petitgrain come from flowers and leaves and get distilled too, so basically it depends on which part of the tree.

And in Japan most yuzu oil is distilled, mainly around Kōchi, says the club's page on how yuzu oil is made.

joon.yuzu wrote:

it depends on which part of the tree

That's the bit I was missing, thanks.