Lässig began competing in endurance sports car racing, often World Sportscar Championship races in the early 1980s for Obermaier Racing and drove in several 24 Hours of Le Mans races.
He and the Kremer Racing team were the winners of the 1995 24 Hours of Daytona.
He retired after the 1997 24 Hours of Le Mans driving for Kremer.
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