Why is it necessary to change vehicle oil regularly, and not just change the filter and add new oil as needed?
In: Engineering
The filter keeps stuff out of the oil but the oil it self goes bad and stops being able lubricate the engine properly after enough time and or usage has passed. It gets heated up and cooled down and churned up by the engine over and over and eventually goes through chemical changes that make it less effective. This causes increased fritcion and thus wear and tear on the engine which if left to get bad enough will greatly shorten the lifespan of said engine.
The oil filter is not perfect either so contaminents will still build up. Just being outside like most cars are is enough to age the oil over time.
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