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Ever ran your hands under constant 90-100 degrees water?

Well it might answer your question.
The engines cooling system runs at <90degrees (on hondas).
Oil can reach in excess of 100degrees.

Aluminium melts at some x000 degrees. Combustion is xxxx degrees, and is happening 750-850 times a minute. (idle).


Long answer short. Its normal.
Just thought id give you something to think about next time you ask if something that has, 750 explosions happening a minute, is considered normal to be hot.