Euser won Dutch Formula Ford titles in 1980 and 1981, also claiming the Formula Ford Euroseries championship in 1981. He moved into single-seater ladder racing with part-time entries in the FIA European Formula Three Championship in 1982 and 1983, before broadening his programme in 1984 to include both the British and German Formula Three series. His best result that year came in the German championship with Josef Kaufmann Racing, where he finished seventh with a race win, a pole position, and three podiums.
Euser made his International Formula 3000 debut at the final round of the 1986 season at Jarama and spent four seasons in the series through 1989. His best championship result was nineteenth in 1988, where a fifth-place finish at Brands Hatch provided his most notable points score. He failed to qualify on several occasions across the campaign and ultimately did not establish himself as a frontrunner in the series.
In 1990 Euser entered the World Sports-Prototype Championship with six starts split between Chamberlain Engineering and Spice Engineering. In 1991 he committed to the Sportscar World Championship full-time with Euro Racing, finishing fourth in the championship. That same year saw him make a lone CART World Series start for Bettenhausen Motorsports at Laguna Seca, and compete in the DTM with the Marlboro BMW Dealer Team. He also made his first 24 Hours of Le Mans appearance in 1991.
In 1994 he returned to Le Mans in the GT2 class with Konrad Motorsport, finishing third in class. At Daytona he raced with Konrad across 1994 and 1995, taking second in the LM WSC category in 1995.
In 1995 Euser joined Team Marcos as a factory driver and subsequently purchased the manufacturing rights to produce and campaign Marcos racing cars under his own banner, Marcos Racing International. He ran the Marcos LM600 and later the Mantis in international competition across the BPR Global GT Series, FIA GT Championship, British GT Championship, Dutch Supercar Challenge, Spanish GT Championship, Belcar, and various endurance races worldwide.
In the BPR Global GT Series in 1996 he took three class wins. He raced in the FIA GT Championship from 1997 through 2000 in the GT2 class, earning numerous pole positions — including five in 1998 — and regularly challenging on class podiums. His British GT Championship programme in 2000 produced three wins and a third-place overall finish.
After the height of the Marcos international programme, Euser accumulated a substantial record of national and regional titles. He won the Dutch Supercar Challenge GT class in 2002, 2004, and 2009, and the Euro GT Series Class A title in 2002. He won his class at the Dubai 24 Hour in 2006. He took the Supercar Challenge Supersport class in 2014 and the Spanish GT Championship C1-GPX class in 2022. He won the Dutch Race Driver Organisation M3 class in 2018, and claimed the Masters Endurance Legends GT category in 2024. As of 2026 he continues to race in the Supercar Challenge and Endurance Racing Legends series.
Euser's career spans more than four decades of active competition. His acquisition and continued development of the Marcos brand made him the central figure in the marque's racing story from the mid-1990s onward, keeping a traditional British GT constructor visible in international competition for many years. His longevity and range — from Formula 3000 and CART to 24-hour endurance events and club-level GT racing — is exceptional among drivers of his generation.
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