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]
(..) in order to come up with an agreement. Along with partners in the private sector, the United States, China, and Russia will collaborate on a plan to extract oil from untapped sites in eastern Siberia. This will then enable a return to a more stable oil market, as well as a stable global economy. (..)2016 TvShow: House of Cards Title: Chapter 45 Season: 4 Episode 6
(..) You don't have to be delicate, Cathy. I'd like you to let me do my job. China cannot be at the center of this negotiation, or Raymond Tusk. Involving the oil companies is the only shot we have at winning Republican support. Do you remember when we played beer pong and you let me win? (..)2016 TvShow: House of Cards Title: Chapter 45 Season: 4 Episode 6