If there are no external coolant leaks, you get the product that goes in the oil and not the one that goes into the radiator. It would help to name the product and mention how it is to be used.
If the oil is turning gray, the opposite may be true. If a cumbustion chamber crack is involved, nothing will help. The instructions for radiator stuff must be followed to the letter. Even if you do follow the instructions the radiator still might plug up.