The working fluid is the core of the heat engine, and the Carnot efficiency is independent of the working fluid (core). ？？！！！

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Bo Miao

The more textual explanations there are, the more false they become.

E. M. Apfelbaum

In ideal Carnot cycle the efficiency depends the temperatures of cooler and heater. And no dependence on the properties of a substance between them. But in reality the contacts between a substance and heater/cooler are not ideal. So real efficiency is less and it starts to depend upon the properties of a substance as well as on the properties of cooler/heater other than the temperature.

It's a bit illogical, I won't argue anymore. Carnot efficiency is independent of the working fluid -—— the second law of thermodynamics violates common sense and is lower than the average level of human intelligence.