Some spell it Aglio Oil and some Oglio Oil.
...and only the former would be correct

aglio = garlic
olio = oil
aglio e olio = garlic and oil
olio d'oliva = olive oil (Don Altobello says it in GF3)
PS - For some reason my Sicilian dictionary doesn't have the word "oil" in it, but garlic is
agghiu. Maybe "Oglio" is correct there? Don't know...