OK to freeze buttermilk? Pancake batter?

1-1/2 cups uncooked oatmeal
2 cups buttermilk
3 eggs
1 cup whole wheat flour
2 teaspoons baking soda
2 teaspoons brown sugar

Combine the first three ingredients and let stand 1/2 hour or overnight in the refrigerator. Add the rest of the ingredients and mix together. Cook on oiled griddle.