Well, "X oil" does not necessarily mean "oil made by pressing X", it can also mean "oil infused with X". Case in point: chili oil, or "olio al peperoncino", has

Well, "X oil" does not necessarily mean "oil made by pressing X", it can also mean "oil infused with X". Case in point: chili oil, or "olio al peperoncino", has been made in Italy for centuries and the name is not made up to confuse consumers. In fact, one can argue that the English language is really the problem here, because it does not have prepositions like e.g. Italian has. In Italian, we wouldn't be having this argument, because "olio al peperoncini" or "olio al tartufo" are clearly in a different class of things from "olio di olivo" or "olio di noce".