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There's nothing else that would cause oil in the coolant tank other than a leaking head gasket. You can have no coolant contamination in the oil and have oil in the coolant.
I ran my car for about 500-1000 miles when it was just starting to get oil in the coolant. It ran perfect. But soon my coolant turned into a nice peanut buttery sludge. After I did the head gasket. It took 15K miles, a new radiator,new coolant tank, 3 coolant flushes, and constant cleaning of the coolant cap to get rid of the oil contamination completely. Don't let it get too bad by driving it, or you will pay the price down the line!
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