Holding a 40% share of the global market for original equipment A/C Compressors, DENSO is the world leader in the market. Never add oil directly into the compressor, but instead to the condenser, receiver dryer or second evaporator cycle. ![]() Always check the car manufacturer data to confirm the correct oil amount. For some applications it is necessary to add oil: For example, where there is one and the same part number for Single and Dual evaporator cycles or when the oil quantity of the new compressor differs from the vehicle specifications.This will avoid damage when the compressor starts moving or during start-up. Turn the compressor systematically by hand to distribute oil evenly. If the system has been flushed with refrigerant: Original DENSO Compressors which are delivered with the correct amount of oil can be installed directly.Check the compressor installation guide for the appropriate oil drain procedure. After removal of the old compressor: Drain the oil from the compressor and measure the amount.The volume drained need to be charged to the refrigerant cycle when refilling with refrigerant. It is essential that this oil is drained off at the A/C service station and its volume measured precisely. After recovery of refrigerant: When removing refrigerant, some compressor oil will be mixed with the refrigerant and will be removed from the refrigerant circuit together with the refrigerant.Both too much or insufficient oil will reduce life time of compressor and influence system cooling performance. The amount of oil necessary for a typical system depends on type of compressor and system design and is measured to meet this combination. In some cases this can be differ from the vehicle specifications so always check car manufacturer data. The new label will also display the amount of oil inside the new compressor. To identify the correct oil type, always refer to the compressor identification label - either attached to the rear or side of the compressor. This will likely lead to compressor seizure and definitely will reduce the life expectancy of the compressor. Different viscosities cause a thinner oil film to form between the cylinder and piston, the low miscibility with refrigerant causes insufficient circulation of oil therefore reducing lubrication and cooling of the compressor. Universal oils, often preferred by garages, are PAO-oils with a different lubrication performance, viscosity and low miscibility with refrigerant to that of synthetic PAG-oils.The use of incorrect oils, such as universal oils or oil mixtures, inevitably leads to seizure and damage, and is the second most common reason for A/C compressor failure. DENSOs A/C compressor warranty claims show that in a quarter of all cases garages did not use the correct PAG-oil.Knowing the common causes of compressor failure should therefore be of vital importance to garages and installers. ![]() When faults with compressors occur, they can be costly and labour-intensive to rectify. ![]() ![]() The compressor acts as the heart for the A/C system performing a critical role whereby, if the compressor stops working, the Air Conditioning system will fail too. The oil therefore should have the correct lubrication performance, viscosity and miscibility with refrigerant. Compressor oil lubricates and cools the moving parts of the compressor and forms a film between cylinder and pistons.
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