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The oil in the coolant is caused by a failed oil cooler. The oil cooler is mounted on top of the engine under the intake manifold. The oil cooler will have to be replaced and the cooling system will have to be flushed out. We use Simple Green, 2 gallons of it in the cooling system to clean the oil out. The oil cooler is not a simple job, it is about 14 hours to replace the oil cooler and flush the cooling system. The turbo, intake manifold and EGR cooler will have to be replaced to replace the oil cooler.