Do not try to use any Lucas products. I have read several demonstrations in which Lucas stuff was shown to cause your oil (differential gear oil, engine oil, transmission oil etc....) to foam and have trapped air, which very much destroys the lubrication properties.
Stay away from these products. If you want to help recondition PS seals, just use the brand name ones such as Prestone or Maxlife ($2->$3 / quart)
Do not waste your money for no-name stuff.