Manthey's career as a driver began in 1974. In the 1980s, he won two races of the Deutsche Tourenwagen Meisterschaft.[1] Retiring as DTM racer after 1993, since 1994 he worked for Persson Motorsport in Deutsche Tourenwagen Meisterschaft, which ran Mercedes cars.
After the DTM faltered in late 1996, he set up his own business near the Nürburgring, focusing on Porsche road cars and his team Manthey Racing in the German Porsche Carrera Cup, which he as driver had won in 1990, and in the Porsche Supercup. He continued racing on the long Nürburgring, mostly in the 1990s with DTM-based Mercedes 190, later with Porsche 911 GT3. Since 1999, his team receives a various degree of factory support from Porsche, or acts as factory team, or with factory-paid drivers.
In 2012, Manthey decided to leave the VLN series and enter the International GT Open instead. However, the team still ran a car at the 24 Hours of Nurburgring that year.
Manthey has taken 30 overall victories at the Nürburgring Endurance Series(formerly VLN) in his career, more than any other driver.[2]
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