The other day riding I noticed my 12 800 coolant had turned black with a scuzzy milky film on the top. I rode it for a hour more and the film got a bit higher by the time I made it to my truck it was at the top. About two hours of riding from the time I noticed to when I stopped. The next day I drained tbe coolant to find the milky substance floating the pervious day was gone. However the bottle was coated in a dark oily soot. I'm hoping it's just the top gaskets. Has anyone else seen this.