Genuine Ford Fluid XL-4 Synthetic Supercharger Fluid - 4 oz. Required for top-off of fluid level in superchargers on: Thunderbird SC , Lightning F-150, Harley Davidson F-150, Mustang Cobra, GT, Shelby GT 500 Tapered neck applicator bottle for easy use Formulated for automotive use Lubricates and protects Use according to owner guide recommendations