Why is it necessary to change vehicle oil regularly, and not just change the filter and add new oil as needed?

Question

Why is it necessary to change vehicle oil regularly, and not just change the filter and add new oil as needed?

In: Engineering

Answer 1

In most cars, you have to drain the oil to change the filter in the first place. Because if you don’t, the oil will drain out of the space where the filter is supposed to go.