How Often Should Car Air Conditioning Compressor Oil Be Replaced?

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Car air conditioning compressor oil replacement intervals should be determined based on the quality of the compressor and the frequency of air conditioning use. Under normal usage conditions, it is reasonable to replace car air conditioning compressor oil once a year. Compressor Oil: Compressor oil serves as a sealing medium for the compressor, ensuring safe operation while reducing friction and energy consumption. It possesses excellent performance characteristics, forming an oil film on the compressor surface to provide lubrication and protection. Compressor oils can be divided into two categories: piston/rotary compressor oils and refrigeration compressor oils. Piston and rotary compressor oils operate at higher temperatures. For most compressors, the temperature of air or gas after each stage of compression typically exceeds 170-180°C, though some high-thermal-intensity piston compressors may reach outlet temperatures over 220°C. To ensure safe compressor operation, extend oil change intervals, maintain clean pneumatic systems, and reduce friction and transmission energy consumption, piston and rotary compressor oils should have good thermal stability to prevent carbon deposits, along with excellent anti-corrosion, anti-emulsification, and anti-foaming properties. Compressor Oil Replacement Method: When replacing refrigeration oil in rotary compressors, first seal the compressor's low-pressure pipe and drain the refrigeration oil. Then connect the compound pressure gauge manifold valve to the compressor's high-pressure gas pipe, with one end of the high-pressure pipe connected to a vacuum pump and the low-pressure valve hose inserted into a measuring cup. Start the vacuum pump to create a vacuum inside the compressor, then close the high-pressure valve and open the low-pressure valve. The refrigeration oil in the measuring cup will be drawn into the compressor. When an appropriate amount of oil has been added, close the low-pressure valve to stop the oil intake.