 He repeated the success at Mercedes-Benz in 1992 and 1994, before moving back to sports cars racing for them in 1997 to become the 1998 FIA GT Champion.He retired when the series did not continue in the 1999 season.He soon returned in June 1999, to win the 24 Hours Nürburgring on the Nordschleife for the third time driving a Zakspeed Viper.