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When I went to drain the Evans out of the radiator, it came out black. I thought it was oil at first! I double checked and it wasn't oil, but I can't help but ... Yup. Oil pressure is 80+ psi, water pressure 15 psi max. So... generally when there's a breach between the oil gallery and the coolant passages ... You may have soot in the coolant from the combustion process. Just a guess, soot is black. How, without other symptoms, I don't know. Share your videos with friends, family, and the world. Cross contamination from the combustion chambers. Mix carbon etc. with antifreeze and you get oily gel. Normal sediments from the cooling system ... The issue is this coolant is not really circulated so it has a chance to grow stuff, have oily film buildup, and other things. Explore Unmatched Thermal Performance with Go Chiller High-Performance Coolants Collection · Go Chiller Original Black Coolant: Precision Cooling, Stylish ... If your coolant is dark, looks brown, or you see particles floating around, it's time to for a flush and fill. Save at your local NAPA AUTO ... I've got black sludge in my coolant. It does not appear to be oil. It was thick on the cap, almost like a paste, and dipping a rag into the radiator, it came ... Elevate your machining game with Black Gold Coolant Rings. Explore precision-engineered rings designed to enhance coolant flow and tool performance.