(Reuters) – Italian refiner Saras said on Monday its first-quarter comparable core earnings swung to a profit helped by surging oil prices and diesel refining margins, driving shares up 7.3%. The group reported comparable adjusted earnings before interests, taxes, depreciation and amortization (EBITDA) of 62.0 million euros ($64.62 million) in the three months to March, up from a loss of 11.2 million in the same period last year. The refiner says it expects a positive impact on its net financial position in the second quarter of the year from surging diesel refining margins. The financial posi…