Three engine suppliers joined the new championship at its inception: Mercedes-Benz, produced by HWA; Opel, produced by Spiess; and Toyota, produced by TOM's. A limited number of teams have competed with Renault and Mugen-Honda powerplants. In the 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.