Abstract
The authors have developed a new technology that enables it to use lubricating oil (LO) semi-permanently and reduces LO consumption. Also, the technology remarkably improves reliability of machines. The techonology always keeps LO clean as the kidney of animals always keeps their blood clean. It is, therefore, called kidney system. There is no oil renewal forever and it is enough to supply only a small amount of fresh oil sometimes to compensate for the lost oil. No waste oil is, therefore, generated in the kidney system. The system has been working well in about 1000 units of marine and cogeneration diesel engines and in many hydraulic machines almost without any machine troubles for many years. In the kidney system, detergent disperesant and antioxidant are not needed. Only in case fuel contains some sulphur, alkali and disperesant are needed also in the kidney system.The dispersant is used to keep the alkali dispersed in LO.In this paper, it is reported based on the field data why detergent dispersant and antioxidant are not needed and harmful in the kidney system.
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