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More than likely you have a problem in the head, we had a similar issue that was slowly using antifreeze and overheating and shutting down after about an hour...no sign of water in the oil then it finally gave out and the oil was full of water. pulled the head and sent it in for rebuild and they found the problem was a interior frost plug that had a small corrosion hole thru it ( 1/8). I replaced the injectors, new glow plugs, boiled the heat exchanger out etc it now runs better than ever. This was on a 12 kw NL.
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