Vietoris finished his first FBMW campaign sixteenth in the Drivers' Championship with fifteen points, sharing his position with fellow German Dominik Wasem.

Following his impressive performances in Formula BMW, Vietoris was picked by A1 Team Germany to replace Nico Hülkenberg for the Mexican round of the 2006–07 season.

Vietoris won four races over the course of the season, adding a further four podiums and a fastest lap at Brands once again, as he helped keep Mücke in contention for the teams title until he left for GP2 Asia.

Vietoris missed the final round of the F3 Euroseries season to join up with the DAMS team for a GP2 Asia Series test at the Yas Marina Circuit in Abu Dhabi.

After crashing heavily during the first round of the season at Istanbul, he complained of recurring headaches and was replaced by Álvaro Parente until he recovered and returned to the cockpit in Valencia.

Vietoris made his debut in the DTM, dovetailing his 2011 GP2 campaign with a season driving a Persson Motorsport Mercedes in the Deutsche Tourenwagen Masters.

[citation needed] On 3 April 2012 Mercedes announced the revival of the Mercedes-Benz Junior Team that has guided several notable drivers in their racing careers like Heinz-Harald Frentzen, Karl Wendlinger and Michael Schumacher.