| Heavy oil
Internal name: heavy-oil
Prototype type: fluid
Heavy oil is a liquid produced by refining crude oil in an oil refinery. It can be processed into light oil and lubricant. Solid fuel and flamethrower ammo can also be created from heavy oil. It is more efficient to process heavy oil into light oil before creating solid fuel from it.
|Oil refinery||Basic oil processing||+ => + ( )|
|Oil refinery||Advanced oil processing||+ + => + ( )|
|Oil refinery||Coal liquefaction||+ + + => + ( + )|
- Changed fluid color to match icon color.