Your car goes through a lot. From dirty particles in the oil it uses to squashed bugs on the front bumper, it is very easy for it to get filthy very quickly, and it is the primary function of filters to delay that process. Air filters at the front of your car prevent dirt from getting into the engine bay, while oil filters inside the bay stop bad oils from getting into the engine and wearing it down from within. Fuel filters block hazardous materials from getting through in the gallons and gallons of fuel you put in your car every week. They all play important roles in maintaining the health of your car during its lifetime.