Only two ways for that to happen. Either you have a blown head gasket (gasket de-laminates and permits oil to travel to a water jacket) or your automatic transmission cooler (actually inside one tank of the radiator) has failed. Unless someone accidentally poured oil in there, that's the only way oil can enter. Reddish oil is from the transmission, brown is engine. After repair, make sure you change/replace the oil in which ever system is turns out to be as coolant can also enter through the same place, especially after you turn it off and coolant pressure is higher than oil pressures..
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