Remove giblets and neck from turkey cavity. Rinse turkey with cold water and pat dry with paper towel. Tie ends of drumsticks together.
Place turkey, breast side up, on rack in roasting pan. Brush turkey with oil. Insert meat thermometer into thickest part of meat, not touching bone.
Stir stock, lemon juice, basil, thyme and black pepper in large bowl. Reserve 1-3/4 cups stock mixture for the gravy. Pour remaining stock mixture over turkey.
Roast at 325 degrees for 3 hours, or until thermometer reads 165, basting occasionally with pan drippings. Begin checking for doneness after 2-1/2 hours’ roasting time. Remove turkey from pan, cover and keep warm.
Spoon off any fat and pour off all but 1-1/2 cups pan drippings. Stir reserved stock mixture and flour in medium bowl until the mixture is smooth. Add flour mixture to the pan.
Cook and stir over medium heat until mixture boils and thickens, scraping up browned bits from bottom of pan. Serve gravy with turkey.