Oilmines produce oil over time. The oil is collected by the central oil rig and then transferred to the gas station, where it is converted into value.

Oil Empire contains 25 oilfields.

Each oilfield contains 24 oilmines.

Oilmines can be improved through upgrades such as production, storage and production speed.

Automation allows the relevant production system to continue operating without requiring you to manually start every production cycle.

Yes. The central oil rig can be upgraded to improve how quickly it transfers oil and how much oil it can hold.

Yes. Gas-station upgrades can improve its operating speed and the amount of oil it can handle.

Its storage may be full, or the production cycle may need to be started manually if Automation has not been unlocked.