Purolator L34875 Classic Oil Filter Oil is designed to clean, cool and lubricate the metal surfaces of the engine, neglecting oil and filter changes may result in the deterioration of the engines internal parts, overheating and corrosion Change the oil and oil filter every 3000 miles or as specified by the manufacturer, changing the oil without changing the filter can leave up to a quart of dirty oil to be re-circulated into the engine Internally lubricated nitrile gasket requires less torque for filter removal Multi-fiber, high density media filters out harmful contaminants Anti-drainback valve minimizes engine dry start