BMW-Sauber test driver Christian Klien has dismissed as "unnecessary" some of the expenditure in formula one.

Nov.8 - BMW-Sauber test driver Christian Klien has dismissed as "unnecessary" some of the expenditure in formula one.

"Perhaps too much money is wasted," the Austrian, who last season tested with the Honda team, said in interview with the newspaper Kurier.

"Take Jenson Button: he uses 18 helmets per season and every one costs 6,000 euros before the paint. I ask myself if this is necessary," said Klien.