In its later years, Sauber's links with Ferrari became weaker. They sided with the non-Ferrari teams over planned rule changes at the end of the 2004 season and also joined up with the GPWC. Then they decided to switch to Michelin tyres, while Ferrari continued to use Bridgestone tyres. Meanwhile, beverage company Red Bull left Sauber in 2005 as they founded their own team, Red Bull Racing. BMW ownership commenced from 1 January 2006 with BMW having bought Credit Suisse's share in the team. Sauber's final Grand Prix before BMW takeover was the 2005 Chinese Grand Prix, with Massa scoring a welcome sixth place to round off the team's history. Sauber had finished its independent run in F1 with six third places and two front-row starts being their best results. Amongst notable Sauber drivers were Jean Alesi, 2008 Drivers' Championship runner-up Felipe Massa, Johnny Herbert, and 1997 World Champion Jacques Villeneuve. Two former Sauber drivers drove for the new BMW Sauber team in 2006: Nick Heidfeld who was a Sauber driver from 2001 to 2003, and Villeneuve who drove for the team in 2005.