Respuesta :

odiapraise2020

Answer:

Oil

Explanation:

Since, unlike oil, source like wind, solar, water etc. come naturally we don't and can't replace them but when the viscosity in oil has been used up it must be change to allow the proper functioning of the machine.

Answer:

I think it's oil but im not 100% sure

hope this helps

have a good day :)

Explanation: