... Vacuum system: canmeetthetechnologyrequired.6. Filtration system: to quickly filter out mechanical impurities in the base oil, gasoline and ... ,advantage introduction1. Low cost,catalyst cost is about 30$ for refine one tons used motor oil, these two ... any restrictions.2. An automatic machine which operationissimple, 1 or 2peopleoperate this machine is enough.3.Very environmental friendly, this ...