Audi auto parts, including W, are produced by German ZF Group. Headquartered in Friedrich Port, Germany, ZF Group is the world's leading supplier of transmission and chassis technology. Its accessories are widely used in the automobile industry and enjoy a high reputation. As a German automobile brand, Audi's parts suppliers are mostly well-known German manufacturers, such as ZF Group, Bosch and Mahler. ZF Group is famous for its high quality and reliability, and its accessories can provide excellent performance and reliability guarantee for Audi cars. Therefore, the W mark on Audi auto parts usually means that the parts are produced by ZF Group in Germany.