What is the purpose of engine oil in piston engine?

Question

Question PPL(H) - Private Pilot License - Aircraft General Knowledge

QuizVDS · Accepted Answer

Cooling, lubrication of the engine and disposal of fine abrasion.

QuizVDS · Answer

Cooling, lubrication and increasing engine performance.

QuizVDS · Answer

For nose reduction and bearing of the propeller shaft.

QuizVDS · Answer

Cooling of the engine and lubrication of propeller shaft.

Id 226 - PPL(H) EN - What is the purpose of engine oil in piston engine?