Is the gasoline filter of Audi A4L flash or external? How often should it be replaced?

Our business involves vehicle source service, overseas warehouse, spare parts supply, vehicle export, etc. There are more than 40 employees. The management team has been engaged in the automobile industry for more than ten years. They have rich marketing concepts and perfect management mechanisms. By integrating the supply of automobiles, they integrate inspection and customs clearance, after-sales guarantee, and regulatory services to create an automobile that integrates trade, logistics, and finance. The export service system, adhering to the concepts of integrity, learning, responsibility, execution, pragmatism, strictness, harmony, and excellence, aims to create a comprehensive automotive supply chain service integrating trade, finance, logistics, and information operations. Welcome customers to visit and guide.