Refrigerant Oil
CAUTION:
Risk of acid burns due to atomized refrigerant oil. Eye or other body injury possible.
- Wear safety gloves.
- Wear protective eyewear.
- Never breath in atomized refrigerant oil.
- Refrigerant oil mixes with the refrigerant (about 10 to 40%, depending on compressor type and refrigerant quantity), circulates continuously in the circuit and lubricates the moving parts.
- Special synthetic refrigerant oils are used in connection to R1234yf-A/C systems, for example polyalkylene glycol-based (PAG) oil with specific additives adjusted for the refrigerant. This is necessary, because for example mineral oil does not mix with R1234yf and because without these additives unwanted reactions to the refrigerant or the refrigerant circuit components can occur. In addition, the components of the R1234yf A/C system could be affected if the mixture flows through the refrigerant circuit under pressure at high temperatures or the lubricating film in the A/C compressor tears. The use of non-approved oils can lead to the failure of the A/C system and exclusive use is therefore to be made of authorized refrigerant oils. Refer to the Electronic Parts Information (ETKA).
- Oil type for the refrigerant R1234yf in motor vehicles: PAG oil with specific additives adjusted for the refrigerant R1234yf (polyalkylene glycol with specific additives).
- The most important properties are the high degree of solubility with refrigerant, good lubrication, no acid content and very minimal water content. For this reason only very specific oils may be used. Refer to the Electronic Parts Information (ETKA) and Technical Data (vehicle-specific repair information) for a list of the approved refrigerant oils and capacities.
- PAG oils, which are appropriate for refrigerant R1234yf, are highly hygroscopic and do not always mix with other oils. For this reason only use the approved refrigerant oils.
- Moisture and acids promote aging of refrigerant oil, causing it to become dark and viscous as well as corrosive towards metals. For this reason close containers with refrigerant oil to protect it from moisture, immediately seal opened containers.
- Used oil disposal: Volkswagen InfoNet; Operations; Handbooks & Dealer Literature; Service Handbook; 15. Environment Protection; follow the link "Environment Protection in Market- and Service Operations" under general information; 4. Waste management; 6. Methods of Disposal; g. Disposal of Used Oil; Refrigerant Oils
- For refrigerant circuit with refrigerant R1234yf only the approved oil may be used for this refrigerant and the installed A/C compressor. Refer to the Electronic Parts Information (ETKA) and Technical Data .
- Refrigerant oil which was developed for Refrigerant R134a is not suitable for refrigerant circuits with refrigerant R1234yf (a specific additive is missing). For this reason pay attention to the version. Refer to the Electronic Parts Information (ETKA) and REFRIGERANT OIL .
- Refrigerant oil which was developed for refrigerant R1234yf, can also be suitable for refrigerant circuits with refrigerant R134a. Refer to the Electronic Parts Information (ETKA) and Technical Data (vehicle-specific repair information).
NOTE:
Do not store open containers of refrigerant oil because it is hygroscopic (attracts moisture).
Always keep containers with refrigerant oil and the refrigerant circuit closed.
Do not use ester-based oils (POE oils). These are currently only for larger systems under different operating conditions (not for vehicle A/C systems).