Hi and thanks for using 2CarPros.com.
A leaking head gasket can leak different ways. First, coolant can enter the engine and mix there with the oil. Second, it can simply be a loss of compression. Third, an intake gasket or head gasket can allow oil to enter the coolant. Additionally, if your truck has a transmission cooler which runs through the radiator, and most do, ATF can be mixing with the coolant. If your truck has an oil cooler which uses coolant to cool the oil, I have seen pin holes develop which allow oil to enter the coolant.
What I suggest is this. First, lets check for a bad head gasket. Here is a link which describes how to test one:
https://www.2carpros.com/articles/head-gasket-blown-test
Let me know if this helps or if you have other questions.
Take care,
Joe
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Sunday, July 29th, 2018 AT 9:17 PM