I asked the mechanic to check the 'oil'. [=to make sure that there was enough oil to make the car engine run smoothly]
The dressing is made with 'oil', vinegar, and a pinch of herbs.
He works mostly 'in oils'. [=he mostly uses oil paints]
(..) - I remember thinking no one will ever make the mistake of confusing her with the real "Gibson Girl." Don't walk away from me! You prescribed castor oil as a purgative. And what is wrong with that? They have been prescribing castor oil as an anthelmintic since the time of the Egyptian pharaohs. (..)2014 TvShow: The Knick Title: The Golden Lotus Season: 1 Episode 9