Tuesday 26 May at 15:59 : May 26 (GMM) BMW-Sauber boss Mario Theissen on Tuesday confirmed that the Swiss based team will use a "multi-level diffuser" for the first time in Turkey in two weeks

After the German squad's disastrous outing at Monaco, he said: "We are convinced that this will be a step in the right direction."nnIt is believed that a decision about whether or not to reinstall the KERS system to the F1.09 in Istanbul has not yet been taken