How much refrigeration oil should be added to a car air conditioning compressor?

[KingMarie]

Generally, small cars require 150-200 grams of refrigeration oil. The specific amount varies for each vehicle, so it is essential to check the vehicle's refrigerant and refrigeration oil capacity nameplate. Below are detailed explanations: 1. Excessive refrigeration oil can lead to: Refrigeration oil in the air conditioning system typically exists in liquid form and has a certain solubility with the refrigerant. Since refrigeration oil has poorer thermal conductivity than the refrigerant, when the refrigerant dissolves refrigeration oil, it can hinder heat exchange between the refrigerant and the condenser pipes in the condensation section, creating a noticeable temperature gradient. The more refrigeration oil dissolved in the refrigerant, the worse the heat exchange performance, leading to deteriorated condensation and heat dissipation. 2. Insufficient refrigeration oil can result in: Accelerated wear of the air conditioning compressor in the system, shortening its service life, or reduced cooling efficiency and increased vehicle fuel consumption.