R12 vs 134a

67Dart273 said

I was under the impression that "things being equal" R12 was a more efficient refrigerant than R134A, but this paper seems to suggest otherwise ESPECIALLY if optimized oils are used with the systems

https://www.aivc.org/sites/default/files/airbase_5960.pdf

Click to expand...

Really interesting. I never knew the reason for different oils. So it looks like if you just dump R134 in it works, but if you change the oil it works a lot better. I usually avoid articles with enthalpy & isentropic in them…..haha.