Preheat oven to 375°F/190°. Clean turkey (discard giblets and organs) and place in a roasting pan. In a small bowl, combine oil, garlic powder, basil, sage, salt and pepper. Using a basting brush, apply the mixture to turkey. Bake for 2 to 2 ½ hours, or until the internal temperature of the thickest part of the thigh measures 160°F/71°C. Remove bird from oven, and allow to stand for about 30 minutes, internal temperature will rise.