Prolong Super Lubricants PSL11000-6PK Engine Treatment Booster - 12 oz, (Pack of 6) Reduces harmful friction and excessive heat in both gasoline and diesel-fueled engines Formulated with AFMT (Anti-Friction Metal Treatment) advanced technology Helps protect the engine in the event of oil or coolant loss Helps restore engine efficiency to optimize fuel economy For both new and older, high-mileage vehicles