1、 The main reasons for the deterioration of the refrigeration engine oil are as follows: 1. The water in the air is mixed into the refrigeration engine oil after it contacts with the refrigeration engine oil due to the infiltration of air in the refrigeration system; The main reason for deterioration of refrigeration oil of Wuhan Central Air Conditioner is that when there is more water in the refrigerant, the water will also be mixed with the refrigeration oil. When water is mixed in the refrigeration oil, the viscosity will decrease and the metal will be corroded. In the Freon refrigeration system, it will also cause "ice jam"; 2. During the use of oxidation refrigeration oil, when the exhaust temperature of the compressor is high, it may cause oxidation deterioration. Wuhan Central Air Conditioning, especially the refrigeration oil with poor chemical stability.