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Soot?.....Interesting. I had OIl dumping overboard from the expansion tank...2-4-cups of it. Parking spot a mess. Investigation found OIL COOLER on driver side of engine (below oil filter) was leaking OIL into COOLANT. The oil pressure is much greater than the coolant pressure so it sent oil OUT rather than Coolant IN.....
Oil cooler is hard to find at this time and costs $500. The cooling system was flushed with dish deterg about 4 times and water 5 times. Still gets a slight oil sheen on the coolant tank.
 
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