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Coolant and oil mixed

  

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Hello, I have a 1997 Dodge Ram 3500 dually with the 5.9L gas V8, 5 speed manual. I’ve been losing coolant but with no leaks, but when I checked my oil I saw that oil and coolant have mixed. I got a block tester to check for a bad head gasket, but the test passed (blue fluid did not change to yellow). What else could be causing this? 


2 Answers
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You most likely have internal leak. 


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Coolant passages in the intake manifold could be leaking into the combustion chamber.  Suspect the intake manifold gasket(s).


I’ll take a look into that. Thank you


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