Will dried buttermilk react with other ingredients in dry mix with oil, stored in fridge? I would like to make a (dry) pancake mix in a large batch, and then store it in the fridge. I have done this before with no problem, and would now like to do the same thing, but add dried buttermilk. I was wondering if the dried buttermilk will store well with other ingredients, while stored in the fridge.

The other ingredients include oil. The full ingredients are: 

4 cups King Arthur white whole wheat flour
1 cup King Arthur Unbleached All-Purpose Flour
3 1/2 cups old-fashioned or rolled oats
3 tablespoons sugar
3 tablespoons baking powder
1 tablespoon salt
1 tablespoon baking soda
1 cup vegetable oil


The source for this recipe is: 
http://www.kingarthurflour.com/recipes/homemade-whole-grain-pancake-mix-recipe
The baking soda and acid from the dried buttermilk should not react in any significant amount until you hydrate the mixture, so it should work.   Remember, baking powder is acid and sodium bicarbonate in the same can, and there is little except acid and reactant; your mix will have a lot of buffer ingredients as well.

I would not add the oil to the dry mix though until you are ready to make the pancakes, along with the water.