As an Audi model, the Audi A4 has a long history of 37 years. The Audi A4 (B8) was first unveiled at the Frankfurt Motor Show in September 2007, and the new styling and production platform have made this car much attention since its launch. On November 16, 2008, the domestic Audi A4L was officially released, which is a wheelbase extension version of the Audi A4, and a luxury mid-size car with a wheelbase extension at that time, and is only sold in the Chinese market. Up to now, the Audi A4L (B8) has been modified twice, and the production volume is 714,687 units.