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well i have got to replace my heater core i just got the part in going to replace it soon .so i have been putting water in my car everyday just to go back and forth to work and i work ten min away.well i go out to put water in my car and i see that my hose that runs from the Radiator cap to my overflow has oil on it all the way from theRadiator to the over flow so i look around and know oil anywere else so i open theRadiator and there is some in there and in my overflow so i look in my oil and know water so im confuse i though that if water is in the oil the head is cracked but what is the oil in the water i have know idea please help