Hello, are you saying you have oil in your coolant system? There is a Transmission Cooler line that runs through the Radiator. The transmission fluid will have more of a reddish look to it.
Here is a guide that will help with finding if a head gasket is blown.
https://www.2carpros.com/articles/head-gasket-blown-test
However, are you suspecting that the oil filter adaptor housing is the issue? If so, I attached the process below on how to replace it so please run through this info and let us know what questions you have.
Thanks
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Saturday, February 12th, 2022 AT 4:57 PM