@Herbie, compared to a refrigerator, the aircon system in a car is exposed to more extreme operating conditions - heat from the engine being one. As over half the aircon system resides in the engine bay, would that not mean that things like the oil would be prone to degradation?
Also, isn't there a "filter" within the sealed aircon system (and I do not mean the pollen filter). If so, would that not need replacing at some point?
Just wondering - please correct me where wrong 🙂
Agree 110% on the transmission side of things. In my books, sealed for life = sealed for 10years/160,000km