I'm playing lightly modded space age and decided to add this mod to get access to some oil, as most of my nearby patches are surrounded by cliffs. I did get a fair amount of oil spawns in a body of water by my base.I went further and explored 2 massive bodies of water and didn't get a single spawn. I found a thread with a similar issue and tried to use the suggested command but it just returns "command not recognized". Has that command been removed, is there a different command I need to use? I considered just adding some through the editor if that's possible. Thanks in advance

The /regenerate-oil command is mostly redundant now. It only recreates the same oil deposits that your map seed would normally produce. If you didn't find any oil in those lakes, it's because that's what the map seed and resource sliders result in. You would have to change those map generation parameters to get a different result. It's very common with default settings to get bodies of water with no oil.