Definition from macmillandictionary.com
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The Middle Eastern countries produce most of the world’s oil.
We need to do more to reduce our dependence on foreign oil.
Heat can be provided by oil, gas, or electricity.
North Sea oil
A large tanker can carry several million tons of crude oil.
Oil prices will probably rise again next year.
an oil company
China has large coal and oil reserves.
Change the oil in your car every 3,000 miles.
Cook the chicken in some oil.
cod liver oil
I prefer to work in oils.
We saw an exhibition of oils and watercolours by local artists.