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Oil was a substance found on some worlds, sometimes mined as a source of energy. The Fourth Doctor complained that being dependent on "mineral slime" did not make sense, suggesting the energising of hydrogen as an alternative. (TV: Terror of the Zygons)
Global Chemicals developed an oil refining process which produced 25 percent more fuel. They also claimed that the process would not cause any waste or pollution, but this turned out to be untrue. (TV: The Green Death)
During the late 20th century drilling of oil off the cost of Scotland started by several companies, including Hibernian Oil. Four oil rigs off the coast of Scotland were destroyed by the Zygons. (TV: Terror of the Zygons)
By the 40th century humans were still drilling for oil, despite the Earth being depleted. Companies like Oil Corp would use mecha oil rigs to drill for oil on distant worlds like Boukon. (TV: The Infinite Quest)