Laxmi Mittal may be the global steel czar but his new love these days is oil and that’s why he and his son Aditya were all smiles as they met Petroleum Minister Murli Deora in New Delhi.Mittal has paid first installment of Rs 500 crore for his 49 per cent stake in HPCL's Bhatinda refinery of his total Rs 3,500 crore investment, which is the largest FDI in the refining sector. HPCL is setting up 9 mtpa refinery, which is scheduled for completion by 2010-11.