How Often Should Car Air Conditioning Refrigerant Oil Be Changed?

[Nora]

Car air conditioning refrigerant oil generally needs to be changed once a year. The refrigerant oil in a car serves the dual purpose of cooling and lubrication. During operation, it helps lower temperatures and reduces wear and tear on internal components. Below are the functions of car air conditioning: 1. Temperature Regulation: This is the primary function of car air conditioning. In summer, the cooling system generates cold air to lower the cabin temperature; in winter, most vehicles utilize residual heat for heating, except for large commercial vehicles, which often use independent combustion heaters. 2. Humidity Regulation: Humidity significantly impacts passenger comfort. Cabin humidity should ideally be maintained between 30% and 70%. Standard car air conditioning systems do not regulate humidity; this is only possible with advanced luxury vehicles equipped with integrated heating and cooling systems or ventilation devices. 3. Airflow Regulation: The speed and direction of airflow greatly affect comfort. Direct airflow should be limited to a certain range when temperatures are optimal, and the speed can be adjusted based on passengers' living environments, age, health conditions, and temperature preferences. 4. Air Purification: Cabin air quality is crucial for ensuring comfort.

[EloiseFitz]

I've been driving for almost twenty years, and I've learned that refrigerant oil is something you really can't overlook. I remember last summer during a long-distance trip when the air conditioning suddenly stopped cooling. After checking for a long time, we found out that it was due to deteriorated refrigerant oil damaging the compressor. The mechanic told me that this stuff generally needs to be checked and replaced every two years or 30,000 kilometers, and if you drive aggressively, you should replace it even earlier. Now, every year before summer, I have the mechanic use specialized tools to measure the viscosity and water content of the refrigerant oil. After all, replacing a whole compressor costs several thousand, which is much more expensive than regular refrigerant oil changes. Especially for older cars that frequently drive on dusty or gravel roads, the dust can easily contaminate the refrigerant oil, so it's even more important to check it often. Oh, and when adding refrigerant, remember to check the refrigerant oil level—this small detail can save you a lot of trouble.

[MacWeston]

Last time I went to get the air conditioning fixed, Master Wang chatted with me while dismantling it. He said that refrigerant oil isn't like engine oil that you change regularly - you have to check the AC's operating condition. If the compressor dipstick comes out black or with metal shavings, it needs to be changed immediately. Under normal circumstances, he recommends changing it every three years - most ride-hailing drivers follow this schedule. The key is to change it together with the refrigerant, otherwise the new oil mixing with old refrigerant can easily deteriorate. He's encountered many cases where strange noises from car ACs were caused by dried-up refrigerant oil, with bearing bushings worn into grooves. Now that it's hot and we're using AC, if you smell burning or hear buzzing noises, checking the refrigerant oil is definitely the right move.