what does moter oil do?

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Edit: motor oil

In: Engineering

Motor/Engine oil is basically a lubricant. It greases the parts which slide or rub against each other to reduce friction and other potential damage caused by it.

Source : https://www.stoneacre.co.uk/blog/what-does-engine-oil-do

It literally prevents metal-to-metal contact of the machine parts. The parts ride on a film of oil instead of rubbing against each other.