[7] One month after the announcement, Oosten made his Lamborghini Super Trofeo Europe debut in the final round at Paul Ricard.

[13] Having made a part-time campaign in the BMW M2 Cup Germany the year prior, Oosten returned to the championship, racing on a full-time basis.

[17] As a reward for winning the BMW M2 Cup Germany, Oosten participated in the FIA World Endurance Championship rookie test in Bahrain for Team Project 1, where he set the fastest time in LMGTE Am during the morning session.

[23] In early 2024, it was announced that Oosten would join FK Performance Motorsport alongside Leon Köhler for that year's ADAC GT Masters.

[28] Taking two more podiums at the Red Bull Ring and Hockenheimring, Oosten finished his maiden ADAC GT Masters season as runner-up in the standings.

[30] Before the 2024 3 Hours of Monza, it was announced that Oosten would join Robin Frijns and Marco Wittmann on his GT World Challenge Europe Endurance Cup debut.