A car air cleaner (air filter) cleans the outside air before it mixes with fuel inside your engine. [12] role-of-air-filters-in-your-vehicle-s-performance)Key FunctionsProtects the Engine: Blocks dust, dirt, bugs, and road grit from entering the cylinders.Prevents Wear and Tear: Keeps abrasive particles away from sensitive parts like pistons, valves, and cylinder walls.Improves Fuel Efficiency: Ensures a proper air-to-fuel ratio so the engine burns fuel earn more about how a car air filter protects your vehicle and improves performance: