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soot in coolant

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    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...
  2. A

    New here. Soot in coolant tank

    Hello I'm new to the ecodiesle community. Today I noticed that there is what looks like black soot on the walls of the coolant tank. Anyone have any ideas of what is the cause? I have a 2015 Laramie with 62,000 miles on it . Bought it used from the dealer black Friday weekend 2018. I hear it...