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What kind of oil goes in AC compressor?


Understanding the type of oil that goes into your vehicle's air conditioning (AC) compressor is crucial for maintaining optimal performance and longevity of the system. As an experienced auto service provider, I aim to clarify the different types of oils used in AC compressors and their importance in keeping your vehicle cool.


Types of Oil Used in AC Compressors


AC compressors typically require specific types of oil that are compatible with the refrigerant used in the system. The most common types of oil include:



  • Mineral Oil: Traditionally used in older vehicles with R-12 refrigerant, mineral oil is less common in modern systems.

  • Pag Oil (Polyalkylene Glycol): This is the most widely used oil in newer vehicles that utilize R-134a refrigerant. It is hygroscopic, meaning it absorbs moisture, which can be beneficial in preventing corrosion.

  • Esther Oil: Often used in systems with R-1234yf refrigerant, ester oil is synthetic and provides excellent lubrication and compatibility with the refrigerant.


Importance of Using the Correct Oil


Using the correct type of oil in your AC compressor is essential for several reasons:



  • Lubrication: The oil lubricates the moving parts of the compressor, reducing friction and wear.

  • Heat Transfer: Proper oil helps in efficient heat transfer, which is vital for the cooling process.

  • System Longevity: Using the right oil can prevent premature failure of the compressor and other components in the AC system.


How to Choose the Right Oil


When selecting oil for your AC compressor, consider the following steps:



  • Check your vehicle's owner manual for the manufacturer's specifications regarding the type of oil recommended.

  • Identify the refrigerant used in your AC system to ensure compatibility with the oil.

  • Consult with a professional mechanic if you are unsure about the correct oil type for your vehicle.


In conclusion, using the right oil in your AC compressor is vital for maintaining the efficiency and longevity of your vehicle's air conditioning system. If you have any questions or need assistance with your vehicle's AC system, feel free to reach out to us at Kevin's Autos for expert advice and service.


Frequently Asked Questions

Can I use ATF for air compressor oil?


Air compressor oil is always the best option for your air compressor. However, if you're in a pinch, you can use either hydraulic oil or automatic transmission fluid (ATF). However, these won't work well for all compressors and may only work under certain circumstances.



What can I use instead of AC compressor oil?


Any 20-weight or 30-weight hydraulic oil should make a good compressor oil alternative.



What kind of oil can I substitute for compressor oil?


Hydraulic oil
Hydraulic oil: Hydraulic oil possesses multiple qualities that make it an acceptable substitute for air compressor oils. It has a lower viscosity in colder temperatures, which means it can flow more freely given its low density. For this reason, hydraulic oil works best when temperatures are lower.



What fluid do you put in your AC?


The most common types of refrigerant fluids on the market are R-22, R-410A, and R-134a. These refrigerant fluids come with their own characteristics, and the one you choose for your AC will depend on the manufacturer's guidelines.



What liquid goes in AC compressor?


Refrigerant is a broad word for the chemical substances used in cooling mechanisms like refrigerators and air conditioners. These substances change phases from liquid to gas to absorb and release heat. Freon is a refrigerant brand name.



Can I use sae 30 oil in my air compressor?


Non-Detergent – if it's compressor oil, it should automatically be ND. Viscosity Grade of 20 or 30 SAE – 30 in normal environments, 20 in cold temperatures.



What can I use for AC compressor oil?


Mineral and synthetic oils are the two types of oils frequently utilised in compressors. Naphthenic mineral oil (MO) is the most often used kind. For a long time, synthetic oils such as glycols, esters, and alkylbenzenes (AB) have been utilised in refrigeration applications without issue.



What type of oil should I use in my air compressor?


Normally, for an air compressor, you can use standard or synthetic oil or non-detergent oil. If the manufacturer has not mentioned any oil then you can use any standard 20-weight or 30-weight oil having no detergents. In general, this oil will be ISO 100.



What oil goes in a car AC compressor?


PAG oil is one of the most common types of oil used in car air conditioners. This type is a synthetic oil that is resistant to high temperatures and has good lubricating properties.



Does AC compressor need lubrication?


Proper lubrication is essential for the smooth operation of car air conditioner compressors. Without adequate lubrication, the compressor may experience increased friction, leading to wear and tear over time. Regular lubrication helps reduce friction, ensuring the compressor functions seamlessly.


Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.