ORIGINAL: spaceworm
Another caveat. The AF mix in the crockpot will turn some ENYA crankcases and other cast parts dark gray (again, don't ask me how I know). This may be a function of how long you cook the parts, but, overnight overcooked my Enya. It was not damaged but the color was dark.
You cannot boil the parts or the parts will turn gray
The parts must be completely submerged or there will be a gray line at the water level
The AF must be kept warm but not boiled.