Yes fatty acids and alcohols come from nature, but NOT crude oil. And since the very first motor oils were made from crude oil, any chemical compounds derived outside the virtues of crude oil makes them a synthetic. I predict your reply to this post will be about how your definition of "synthetic" differs from mine; which proves my whole point: the word "synthetic" is a relative term.
Originally Posted By: Garak
No, not necessarily. PAOs do essentially "come from the ground" if one wants to be picky, but if one also wishes to be picky, fatty acids and alcohols come from nature, too, don't they?