BLACK RESIDUE IN COOLANT RESERVOIR
12-21-2019, (Subject: BLACK RESIDUE IN COOLANT RESERVOIR ) 
Post: #10
RE: BLACK RESIDUE IN COOLANT RESERVOIR
Not sure about detroit, but in the ISX, the most common cause is the oil cooler. Is seeps just enough to make a black sooty type buildup in the resivior tank if the oil is normally black / full of soot.


What color is your oil?. Usually, the only time oil cooler will only make it be brown-ish in color is if the oil is not getting blackened.


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