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oil in coolant

  1. B

    Black oily substance in my 2015 Ram coolant plastic fill tank

    I own a 2015 Ram Ecodiesel V-6. I recently noticed a black, oily film on the top of my coolant overflow tank. My first thought is that I have a head gasket leaking oil into my coolant. I have not noticed an oil loss or milky engine oil and the truck seems to run fine. The engine oil is, in my...