BMW sold its share of BMW Sauber back to Peter Sauber after the end of the 2009 season . Because of their contract with Formula One , the team still formally uses the name ` BMW Sauber ' in competitions for . BMW sold its part to Peter Sauber again after the end of the 2009 season , but the team still formally uses the name ` BMW Sauber ' in Formula One competitions ( June 2010 ) .