| Refrigerator oil mixes (about 20 - 40%, depending on the refrigerant AC compressor type and refrigerant volume) with the refrigerant, constantly circulates in the circuit and lubricates the moving parts. |
| In combination with R134a air conditioning systems, special synthetic refrigerator oils, such as poly-alkyl-glycol (PAG) oil, is used. This is necessary because, for example, mineral oil does not mix with R134a. In addition, the materials of the R134a air conditioning system are attacked if the mixture under pressure and high temperatures flows through the refrigerant circuit or the lubricating film in the AC compressor tears. The use of non-approved oils results in the failure of the air conditioning system, therefore, only approved oils may be filled in, see → Electronic Catalogue of Original Parts. |
| Oil type for R134a in automobiles: PAG |
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| Do not store refrigerator oil when it is open, because it is very hygroscopic (water retentive). |
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| Always keep the oil reservoir closed. |
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| Do not use any used refrigerator oil. Because of its chemical properties, refrigerator oil must not be disposed of with engine oil or gearbox oil. Dispose of as used oil of unknown origin (see waste, Environmental Protection, EU Regulation on refrigerants 2037/2000). |
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