Heat oven to 375°F. Wash turkey, inside and out and dry well. Coat inside and out with oil. Season turkey on the outside with salt and pepper, pressing it in to adhere. Place 2 rosemary sprigs, 1 thyme sprig, 1 sage sprig, 1 oregano sprig and the lemon halves in turkey cavity. In bottom of large roasting pan, place a cooling or roasting rack. Place seasoned turkey on rack and arrange carrots, celery and the remaining herbs on the bottom of the pan around turkey. Pour 1 carton broth and 4 cups water over vegetables and herbs.