The air filter with OEM part number 03-42776-010 is designed for the Freightliner New Cascadia. Its main function is to filter out dust, dirt, and other contaminants from the air before it enters the engine. This helps ensure optimal engine performance, fuel efficiency, and longevity by preventing damage caused by airborne particles. Replacing this air filter according to the manufacturer’s recommendations helps maintain the vehicle’s overall performance and emissions standards.