series' first year, HWA-Mercedes supplied engines for seven entrants from three teams. They included ASM Formule 3, with which it subsequently developed a very successful partnership. Since its first Formula Three championship win with ASM in 2004, Mercedes' success has been influential in its growth in popularity among the Euro Series' teams, and has left Spiess-Opel as the only remaining competition. The 2007 season was the latest season to contain an entry with Opel engines, during that season Volkswagen entered the series. When the series began, all entrants took a conservative approach to their choice of chassis supplier and opted for the established Dallara F302/F303. Alternative chassis have been tested and/or raced on occasions, but for a variety of reasons, they have failed to become established. In the opening round of 2004, a pair of Anglo-Japanese Lola-Dome F106/03 chassis were entered by Coloni Motorsport before the team returned to the Italian F3 Championship. The two chassis builders later parted company, with Lola developing the B05/30 and Dome continuing with the F106. Dome announced its intention to promote its product to Euro Series teams in 2005, though it has not been raced in the series to date. In February 2005, AM-Holzer Rennsport announced its intention to enter a new F3 chassis from the French constructor Mygale – the 05F3. However, Holzer returned to the Dallara F305 by the start of the season. Meanwhile, the experienced French team Signature branched out into chassis design and developed the SLC. A single SLC-Opel was driven by Fabio Carbone alongside three Dallara F305s in Signature's four-car line-up, but it was not quite as competitive as the team had expected and it returned to an all-Dallara line-up in 2006. Updated versions of the Lola, Mygale and SLC have since competed in the ATS F3 Cup. Drivers and teams The profile of the F3 Euroseries has fostered a very multi-national entry list, with approximately 12 to 15 countries regularly represented. It also attracts the best junior single-seater teams from European countries that include France, Germany, Britain, Italy and Switzerland. Many Euro Series drivers have graduated to the DTM touring car series and GP2 F1 support series, as well as racing and testing roles in Formula One. Lewis Hamilton and Nico Rosberg have gained their places in Formula One via championship-winning seasons in GP2. Hamilton's former Euroseries team-mate, All-Japan F3 champion Adrian Sutil, races for Force India, Sebastian