Hi Justin,
More than likely you have a blown head gasket but there are some other things that can cause this.
Here is a guide that will run you through the basics:
https://www.2carpros.com/articles/coolantantifreeze-in-the-engine-oil
https://youtu.be/5zpNjYmmiYY
Just because it doesn't overheat doesn't mean it is not a head gasket issue. I would recommend performing the tests listed in the video to confirm a head gasket. Just based on experience, I doubt it is anything else but a head gasket issue.
Let me know if you need anything else and I will be happy to assist. If you want me to send you the process for replacing these, let me know which engine you have. 3.9L or 4.2L.
Thanks
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Saturday, June 1st, 2019 AT 5:36 PM