Volkswagen Polo Service & Repair Manual: Refrigerant Oil
| Refrigerant oil mixes with the refrigerant (about 20 - 40%,
depending on compressor type and amount of refrigerant) and
circulates constantly in the system, lubricating the moving
parts. |
| Special synthetic refrigerant oils, for example,
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 compressor. Using non-approved oils can
cause the HVAC system to malfunction. Only use approved oils. |
| Refer to the Parts Catalog. |
| Type of oil for R134a in motor vehicles: PAG |
 Note
| Do not store open containers of refrigerant oil because it
attracts moisture. |
| Always keep oil containers sealed. |
| Do not use old refrigerant oil over again. |
| 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 Disposals; g. Disposing of Used
Refrigerant Oil |
| Used refrigerant oils from systems employing halogenated
hydrocarbons (at least one hydrogen atom is replaced, for
example, with the halogen elements fluorine, chlorine, bromine
or iodine) are to be disposed of as waste subject to special
supervision. They are not to be mixed with other oils or
substances. Proper storage and disposal must be ensured in line
with local regulations. Refer to the chemical-climate protection
provision and the recycling and disposal regulations in Germany.
Different specifications and rules may apply in other countries. |
| German technical, work safety and accident prevention
regulations can be obtained from |
| Addresses in other countries can be obtained from the
relevant authorities. |
| Ester-based oils are only intended for use in large systems,
not in passenger vehicle A/C systems. |
| Refrigerant Oil Characteristics |
| The most important properties are a high degree of
solubility with refrigerant, good lubricity, absence of acid and
minimal water content. For these reasons, only certain oils are
used. A list of approved refrigerant oils and capacities can be
found in the vehicle-specific repair manual. Refer to
→ Rep. Gr.00 or
→ Rep. Gr.87. |
| PAG oils, which are appropriate for refrigerant R134a, are
highly hygroscopic and do not mix with other oils. Opened
containers should therefore be closed again immediately to
prevent ingress of moisture. Moisture and acids promote aging of
refrigerant oil, causing it to become dark and viscous as well
as corrosive towards metals. |
Note
| Only use oils approved for the A/C compressor in refrigerant
circuits with refrigerant R134a. Refer to the vehicle-specific
repair manual. Refer to
→ Rep. Gr.00 or
→ Rep. Gr.87. |
| 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 Disposals; g. Disposing of Used
Refrigerant Oil |
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