Caution |
| Refrigerant oil mixes with the refrigerant (in a ratio of about 20 - 40 %, depending on compressor type and quantity of refrigerant) and circulates constantly in the system, lubricating the moving parts. |
| Special synthetic refrigerant oils, e.g. polyalkylene glycol (PAG) oil, are used in conjunction with R134a air conditioning systems. This is necessary as mineral oil, for example, does not mix with R134a. In addition, the materials of the R134a air conditioning system could be corroded as a result of mixture flowing through the refrigerant circuit under pressure at high temperatures or breakdown of the lubricating film in the air conditioner compressor. The use of non-approved oils can lead to the failure of the air conditioning system; exclusive use is therefore to be made of authorised oils. |
| Type of oil for R134a in motor vehicles: PAG (polyalkylene-glycol) |
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| Do not store refrigerant oils in open containers as they are extremely hygroscopic (water-absorbing). |
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| Always keep oil container sealed. |
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| Ester-based oils are only intended for use with large systems (not for motor vehicle air conditioners). |
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