In a large bowl, dissolve the sugar in warm water, then stir in yeast. Allow to proof until yeast resembles a creamy foam.
Stir in the warm milk, salt and oil into the yeast mixture.
Using the dough hook on a mixer or with a wooden spoon by hand, mix in flour, one cup at a time. Knead until smooth.
Place dough in well oiled bowl; turn to coat top. Cover with a clean towel and let rise about 1 hour.
Punch dough down, knead a few times. Divide dough in half.
Shape into loaves and place into 2 greased 9×5-inch loaf pans. Cover and allow to rise 30 minutes or until dough has risen about 1″ above pans.
Bake at 350 degrees F for 30 minutes. Remove from pans immediately and place on cooling racks. Brush the top of the loaves with a little melted butter right after you take them out of the pans so that the crust stays nice and soft.