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]
(..) l'll have you out of here in no time at all. Why, this is-- eh, just as easy as... rollin' off a-- Kind of rusty. - Needs a little oil! - Needs a little oil, needs a little oil, a little oil. That's what l said. Must be one ofthe old models. You mean, you can't open it? Yeah. Looks pretty hopeless. (..)1940 Pinocchio