| The refrigerant oil is mixed with the refrigerant (at a proportion from 20 to 40%, depending on the kind of compressor and the amount of refrigerant), after which it circulates through the circuit and lubricates the mobile parts. |
| Special synthetic refrigerant oils, for example, polyalkylene glycol (PAG) oil, are use in combination with the refrigerant in air-conditioners which use R134a. This is necessary as mineral oil does not mix with R134a. Moreover, the materials used in air-conditioners which use R134a may be attacked when the mixture flows through the refrigerant circuit under high pressures and temperatures, or if the lubricating film in the compressor is broken. The use of unauthorized oils may cause the air-conditioner to break down, and therefore only approved oils must be used. |
| Oil for R134a in vehicles: PAG |
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| Do not store refrigerant oil in open containers, as it is very hygroscopic (water absorbent). |
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| Keep oil containers closed at all times. |
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| Do not reuse refrigerant oil. Dispose of as used oil from unknown source (see Waste, Environmental protection, Refrigerant regulatory legislation (EC) 2037/2000). |
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| Diester oils are only for use in larger installations (not for air-conditioners in vehicles). |
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