Grease and flour 2 (9" x 5") loaf pans. Place oats in a large bowl and pour in boiling water. Set aside to cool. In a small bowl, dissolve yeast in warm water. Let stand until foamy. Add milk, molasses, margarine, salt and yeast to oats. Beat in flours. On a lightly floured board, knead dough 8 to 10 minutes or until smooth and elastic. Place in greased bowl, turning dough to grease all sides. Cover and let rise in a warm place until double in bulk. Punch down dough. Divide dough in half; shape into two loaves. Place in prepared loaf pans. Let rise until double again. Preheat oven to 350 F. Bake loaves 1 hour or until golden brown. Remove from pans; cool before cutting. Makes 2 loaves or 24 slices.