Preheat oven to 350 degrees F. Brush potatoes with vegetable oil and sprinkle liberally with salt. Wrap in foil. Bake potatoes in preheated oven for 90 minutes, or until they are soft when poked with a fork. Meanwhile, place bacon in a large, deep skillet. Cook over medium high heat until evenly brown. Drain, crumble and set aside. When potatoes are done allow them to cool for 10 minutes. Slice potatoes in half lengthwise and scoop the flesh into a large bowl; save skins. Avoid ripping the skin by leaving 1/4 inch of potato on the skin. In a medium bowl, combine the potato flesh, sour cream, milk, butter, salt, pepper, and 3/4 of the cheese. Mix with a hand mixer until well blended and creamy. Add 3/4 of the green onions and 3/4 of the bacon and mix well. Spoon the mixture into the potato skins. Top each with remaining cheese, green onions and bacon. Bake for another 15 minutes.