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How air conditioning works > < Refrigerant oil

A3 Mk2

Properties of refrigerant oil
Properties of refrigerant oil
The most important properties are a high degree of solubility with refrigerant, good lubricity, absence of acid and minimal water content. It is therefore only permissible to use certain specified oils. For a list of approved refrigerant oils and capacities, refer to → Chapter.
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 the ageing of refrigerant oil, causing it to become dark, viscous and corrosive towards metals.
  Note
t  Due to its chemical properties, refrigerant oil must not be disposed of together with engine oil or gear oil. Refrigerant oil must be disposed of as used oil of unknown origin → Audi-ServiceNet, HSO Environmental Protection (or → Volkswagen-ServiceNet, Handbooks, Service Handbook; Environmental Protection; Immission Protection).
t  Only oil approved for the air conditioner compressor is to be used for refrigerant circuits containing refrigerant R134a → Electronic parts catalogue and capacities → Chapter.
   

How air conditioning works > < Refrigerant oil