I missinformed you... Black specks could just be dirt. Your looking for "beads" of oil in your radiator. If you find any at all, this is a sign of a faulty head gasket. If your oil is making its way into your cooling system, then it's possible for coolant to be crossing into your oil. Water is a horrible lubricant, and will cause premature bearing failure, etc. I would get it fixed as soon as possible. Is your car consuming oil?