Ethanol has that OH group. It's a polar molecule, and a small one.
Yes, I was just mentioning it as an example.
But take two pure long-chained fatty acids, mix well, and then what will happen?
I guess they stay mixed. They are pretty similar molecules, so the forces that hold e.g. oleic acid molecules together so that it doesn't evaporate (Van der Waals, I think?) can just as well hold oleic acid molecules to e.g. linoleic acid molecules. (Whereas since water molecules and oleic acid molecules are pretty different, the force between a water molecule and an oleic acid molecule is a lot smaller than between two water molecules or two oleic acid molecules.)
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