i made a pull request on github with the fix if you want a fix while we wait add AddToTable("Krastorio2", "kr-oil", "fluid", "spaced", 3) under AddToTable("Krastorio2", "oil", "fluid", "spaced", 3) in resourceData.lua that should fix it
So looking at the MIT lisc details, i got this "to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software".
Makes me wonder if someone can just upload a modified variation that includes the KR oil fix while we wait for the dev of this one to put out a fix.