Engine oil is that the lifeblood of the engine. All internal, moving components of the motor need to be lubricated by the engine oil.
Insufficient lubrication can cause the components to wear out quicker and eventually cause breakdown. The filter keeps the oil clean and free from debris. If the filter isn’t replaced regularly, it will get clogged and won’t have the ability to pass oil to the motor.
Fresh engine oil is that the color of amber but with time it can turn black and, in some cases, it can even get gritty because it dissolves the dirt. Frequent engine oil changes replace the oil and keep the engine clean.