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Are you sure it is oil residue? If it is dark brown or reddish brown is is probably long life coolant residue. Typically coolant can be forced into oil from a failure of a sort, but not the other way around from what I have seen. Transmission coolers have been known to rupture inside the radiator allowing the two to mix. Your Transmission Fluid gets a stawberry milkshake look to it. But I don't recommend drinking it no matter good it looks. But this condition will wipe out a transmission if not caught early on.

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โˆ™ 2005-10-18 10:55:19
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Q: What could be the reason for having oil residue on the radiator cap in my 1995 Ford Windstar?
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