Refrigerant Oil Properties

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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 are permitted. Refer to Refer to APPROVED REFRIGERANT OILS AND REFRIGERANT OIL CAPACITIES for a list of approved refrigerant oils and capacities.

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:

Refrigerant oil, because of its chemical properties, must not be disposed of with engine oils or transmission oils. Refrigerant oil is to be disposed of as used oil of unknown origin (pay attention to local regulations). Refer to Audi ServiceNet, HSO Environmental Protection (or Volkswagen ServiceNet, Handbooks, Service Handbook; Environmental Protection).

Only the oil approved for the A/C compressor may be used in refrigerant circuits with refrigerant R134a. Refer to the Parts Information and Refer to APPROVED REFRIGERANT OILS AND REFRIGERANT OIL CAPACITIES for the capacities.

Important information:

Refrigerant oil attracts moisture. Close any opened containers immediately after use to prevent moisture from entering.