Volkswagen Golf Service & Repair Manual: Refrigerant machine oil
Refrigerant machine oil is miscible (approx. 20%–40%
depending on the type of air conditioner compressor and the
quantity of refrigerant) in the refrigerant. It circulates
continuously in the circuit and lubricates the moving parts. |
Special synthetic refrigerant machine oils such as
polyalkylene glycol (PAG) oil are used in conjunction with R134a
air conditioning systems. This is necessary because ordinary
mineral oils are immiscible in R134a. In addition the materials
of the R134a air conditioning system could be attacked if the
mixture circulated within the refrigerant circuit under pressure
and at high temperatures, or the lubricant film in the air
conditioner compressor broke down. The use of unapproved oils
can lead to the failure of the air conditioning system, so only
approved oils must be used. |
Type of oil for R134a in cars: PAG |
Note
Do not store refrigerant machine oils open to the atmosphere
since they are very hygroscopic (they readily absorb water). |
Always keep oil containers tightly sealed. |
Do not reuse used refrigerant machine oil. |
Disposing of used oil: Volkswagen InfoNet; Operation;
Manuals and dealership documentation; Service handbook;
15. Environmental Protection; Follow link “Environmental
protection in the dealership and in the workshop” in "General
notes"; 4. Waste disposal; 6. Disposal channels; g. Disposal of
used oil; Refrigerant oils |
Used refrigerant machine oils from systems with halogenated
hydrocarbons (at least one hydrogen atom has been replaced by
e.g the halogens flourine, chlorine, bromine or iodine) must be
disposed of as waste requiring particular care. A mixture with
other oils or materials is not permissible. Proper storage and
disposal must be performed according to guidelines in the
country where the work is being performed. Observe, for example
in the Federal Republic of Germany, the climate protective
regulation concerning chemicals; closed substance cycle waste
management and ensuring environmentally compatible waste
disposal (in other countries other statutes and regulations may
apply) |
Reference sources for technical rules and safety at work /
accident prevention for the Federal Republic of Germany |
Sources in other countries may be obtained from the
responsible authorities. |
Ester-based oils are suitable only for larger systems (not
for air conditioning systems in cars). |
|
Properties of refrigerant oils
The most important properties are high solubility in
refrigerants, good lubrication characteristics, freedom from
acid and very low water content. For this reason, only certain
oils may be used. A list of approved refrigerant oils and
quantities can be found in the vehicle-specific workshop manuals
in
→ Rep. gr.00 or
→ Rep. gr.87. |
The PAG oils suitable for refrigerant R134a are strongly
hygroscopic and are immiscible with other oils. Therefore,
opened containers should be closed again immediately to protect
them from moisture. Refrigerant oils age under the influence of
moisture and acids; they become dark, viscous and aggressive
towards metals. |
Note
For refrigerant circuits with refrigerant R134a, use only
the oil approved for the air conditioner compressor. See
→ Rep. gr.00 or
→ Rep. gr.87 in the repair manual for the specific
vehicle. |
Disposing of used oil: Volkswagen InfoNet; Operation;
Manuals and dealership documentation; Service handbook;
15. Environmental Protection; Follow link “Environmental
protection in the dealership and in the workshop” in "General
notes"; 4. Waste disposal; 6. Disposal channels; g. Disposal of
used oil; Refrigerant oils |
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