The use of incorrect oils, such as universal oils or oil mixtures, inevitably leads to seizure and damage. Insufficient lubrication due to universal oil is the second most common reason for A/C compressor failureĪnalysis of DENSO A/C Compressor warranty claims show that in a quarter of all cases garages did not use the correct PAG-oil that is needed for DENSO Compressors. To guarantee proper oilĬirculation in the refrigerant cycle, the compressor oil has to be pressure and temperature resistant in all operating conditions. Garages should only fill the compressor with refrigerator oil approved by either the car or compressor manufacturer, and should also avoid using universal or multi-grade oils. However, there are huge differences in compressor oil types and quality. The oil film also protects the rubber seals in refrigerant lines and connections reducing the amount of refrigerant leaking out. The purpose of compressor oil is to lubricate and cool the moving parts of the compressor. Practical tip on compressor oil Compressor oil: all you need to knowĪll DENSO A/C Compressors are delivered as complete assemblies, pre-filled with the correct type of compressor oil.
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