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]
(..) Dr. Hall invented the first reproducible process... ...for making synthetic diamonds. I mean, this is way back in the 's. Now, today, synthetic diamonds are used in oil drilling... ...electronics, multi-billion-dollar industries. At the time, Dr. Hall worked for General Electric. (..)2009 TvShow: Breaking Bad Title: Peekaboo Season: 2 Episode 6