An oil refinery can be built by the Prince, who has upgraded all of the principal refining and military facilities of the Principality to Level 5. Read more
Building a facility
Table. Cost of Oil Refinery Construction
One liter of oil produces 1 unit of petroleum product.
Oil refining limit: 10,000 liters/day.
Produced petroleum product can be sold to other clones on the Commodity Exchange or used for their own purposes.