Bardahl 10208-CS B1 Oil Supplement - 12 fl. oz.  (Case of 12) Reduces engine friction and wear and improves fuel economy Increases rust and corrosion protection to decrease harmful deposits Restores power and enhances performance in cars, trucks, farm vehicles and industrial equipment Safe to use in gas or diesel engines and will not harm plastic or Teflon components Suitable for use with all types and grades of motor oil, including synthetics.