Add petroleum resources: crude oil (light, medium, heavy, extra-heavy), natural gas and oil shale. As usual, other mods are expected to add uses, but the fluids will burn if near fire, lava or if they pass into a torch or fire block. Natural gas required a new gaseous fluid behavior that I think is consistent with Minecraft; feedback welcome.
I remembered that. I probably haven't seen it, but does K3 have PFAA mod in generation?