Oil plays a key role in keeping the engine clean and lubricated. And it is the oil filter that keeps the oil and the engine clean for a longer period of time by removing the dirt and contaminants that can accumulate over time. Changing the oil filter is one of the crucial pieces of maintenance that you have to do on your car. Through a clogged oil filter, enough amount of clean oil can’t pass. That’s why the oil filter must be kept clean and replaced once it is spotted clogged. An oil filter can trap billons of contaminants. It must be replaced prior to that.