| Refrigerant machine oil is miscible (approx. 20 - 40 % depending on the type of air conditioner compressor and the quantity of refrigerant) in the refrigerant. It circulates continuously in the circuit and lubricates the moving parts. |
| Special synthetic refrigerant machine oils such as polyalkylene glycol (PAG) oil are used in conjunction with R134a air conditioning systems. This is necessary because ordinary mineral oils are immiscible in R134a. In addition the materials of the R134a air conditioning system could be attacked if the mixture circulated within the refrigerant circuit under pressure and at high temperatures, or the lubricant film in the air conditioner compressor broke down. The use of unapproved oils can lead to the failure of the air conditioning system, so only approved oils must be used. |
| Type of oil for R134a in cars: PAG |
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| Do not store refrigerant machine oils open to the atmosphere since they are very hygroscopic (they readily absorb water). |
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| Always keep oil containers tightly sealed. |
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