[1][2][3] In 2016, Buhk returned to the Mercedes-AMG factory stable to win the overall Blancpain GT Series alongside Dominik Baumann that year.

[10] For 2012 Buhk moved into the Sports car racing, competing in both 2012 ADAC GT Masters and 2012 FIA GT3 European Championship.

With Dominik Baumann they dominated the main category of the FIA GT3 European Championship, winning half of the races and the drivers' title on their Mercedes-Benz SLS AMG GT3.

Despite missing two opening rounds, he won 2013 24 Hours of Spa as well as the season finale at Nürburgring, which brought him title in the series.

He again shared Mercedes-Benz SLS AMG with Götz and was set to claim another championship title after three wins but was forced to miss Slovakia Ring round and the remainder of the 2014 ADAC GT Masters season due to his suspension for non-compliance with safety car regulations in the same circuit in the ADAC GT Masters event.

His team HTP decided to use Bentley Continental GT3 car and make Vincent Abril as his teammate in the Sprint Series.

In 2016, Baumann returned as Buhk's teammate (Jazeman Jaafar was the third driver in the Endurance Cup), while HTP Motorsport bought new-for Mercedes-AMG GT3 car.

For 2017, Buhk got Franck Perera as a teammate for GT Series campaign while Jimmy Eriksson was the third driver in the Endurance Cup.