Here are authentic oil paint colors obtained by scanning real oil paints.
Here is a reference file that you can download, save and use for digital painting. These colors represent true, authentic oil paint colors. I have scan and color corrected real oil paint from many high quality oil paint colors used by real artists and combined the most popular colors here.
It's important to have correct colors when painting. There is an added benefit from having a limited color palette. Too often digital painters will just pull colors off the color wheel and ultimately the final results look garish. Learning proper color theory is a huge boost and pivotal moment for any serious artist.
Let me know if you make any art with these, I would be eager to see your results.