Hi:
If this has an automatic transmission, confirm nothing is mixing with the ATF. Other than that, you most likely have a head gasket issue allowing oil to enter the cooling system. Most times, it is the opposite, but this can happen too.
Here is a link to check for a possible head gasket problem. Take a look through it and see if it helps.
https://www.2carpros.com/articles/head-gasket-blown-test
Let me know what you find.
Joe
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Sunday, November 17th, 2019 AT 8:34 PM