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There are two possibilities, one it is most likely the automatic transmission cooler( in the radiator) is leaking transmission fluid. The other, engine is oil entering the cooling system through a leaking headgasket, cracked cylinderhead or engine block.Keep in mind that the engine oil pressure( normally) is allways higher than that of the coolant system , when engine is running.It is rare but possible that engine oil @ say 40 p.s.i. is entering the coolant system, but when the engine is shut off the coolant system pressure is not high enough to leak into the engine oil .It is not uncommon for(in radiator) transmission coolers to leak oil into the coolant system.

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Q: My 98 Ford Taurus is not over heating but there is oil in the radiator overflow. However there is no water in the oil. What is the problem?
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