Approved Refrigerant Oils
The oils used with refrigerant R12 are not suitable for refrigerant R134a.
The name of the compressor manufacturer "Nippondenso" has been changed to "Denso".
The special refrigerant oil (for use with refrigerant circuits R134a only) is no longer commercially available.
Refrigerant oils specifically designed for each compressor can therefore be obtained from the replacement parts program. .
If a faulty A/C compressor is replaced with an A/C compressor from another manufacturer check for the A/C compressor to be installed has the same refrigerant oil approved which is already in the refrigerant circuit (from the removed A/C compressor). If a different refrigerant oil is approved for the A/C compressor to be installed then the A/C compressor which was removed, the refrigerant circuit must be flushed. Refer to REFRIGERANT CIRCUIT, CLEANING (FLUSHING), WITH REFRIGERANT R134A .
The use of other refrigerant oils could cause system failure, as they do not always mix and thus circulate with refrigerant R134a (for compressor lubrication).
The "Zexel / Valeo", "Denso", "Delphi" and "Sanden" A/C compressors all have different refrigerant oils. .
Beginning from production year 2006, the name of the "Zexel" A/C compressor was changed from "Zexel" to "Valeo".
The refrigerant oil (G 052 300 A2) used in refrigerant circuits with "Denso" compressors (old manufacturing name "Nippondenso") is also included in the retrofit kit (part number 4A0 298 107 A). It is the same for mechanically and electrically driven A/C compressors. .
For refrigerant circuits with "Zexel" - compressors use is to be made of refrigerant oil with part number G 052 154 A2. .
For refrigerant circuits with mechanically driven "Sanden" - compressors use is to be made of refrigerant oil with part number G 052 154 A2. .
For refrigerant circuits with electrically driven "Visteon" or "Sanden" - compressors (for example in the A3 e-tron) use the refrigerant oil with part number G 052 535 M. .
Refrigerant oils with part numbers G 052 154 A2 and G 052 300 A2 can be used in refrigerant circuits with a "Delphi" compressor. .
For refrigerant circuits with an "Zexel / Valeo" A/C compressor, both the refrigerant oil (G 052 154 A2) and the refrigerant oil (G 052 200 A2) contained in the retrofit kit (part number 4A0 298 107) may be used. .
Currently the electrically driven A/C compressor (for example, on the Audi Q5 Hybrid manufactured by "Denso") is filled with the same refrigerant oil as the manufacturer's mechanically driven A/C compressor (refer to the type plate on the A/C compressor). .
Instead of discharging via the A/C service station, the extracted refrigerant oil can either be filled when emptying the refrigerant circuit via an open connection before evacuating the refrigerant circuit, or with valve -3- removed via a service connection -1- or -2- using a commercially available syringe. Refer to CONNECTIONS FOR QUICK-RELEASE COUPLING ON REFRIGERANT CIRCUIT . This is useful for example when a refrigerant oil is specified for a refrigerant circuit, that is normally only seldom used. Always fill with fresh coolant oil. Refer to REFRIGERANT OIL . The arrangement of the service connection -1- or -2- in the vehicle varies. Refer to OVERVIEW - A/C SYSTEM (Vehicle-specific repair information).