Oil is a marketable item, and a processed material. It can be used in the maintenance of Military Units or Buildings to provide a attack or defense damage boost.
Players can obtain Oil by:
Producing 1x Oil in a company consumes 1 Petroleum and 1 Production Point.
Military Unit headquarters consume Oil when active. A Military Unit's owner and commanders can purchase Oil to keep their headquarters active, for an hourly cost between 1 and 10 Oil per hour, depending on the headquarters' level.
Some Government members of a country (all except Minister of Foreign Affairs) can purchase Oil to maintain Buildings in a country's Regions: