The Government of India, today, finally invited preliminary bids for the sales of its entire 52.98% stakes in India's second-biggest oil refiner, BPCL. The bidders will have to submit an Expression of interest (EOI) by May 2, according to the bid document by the DIPAM. BPCL's stake in Numaligarh Refinery Limited, however, has been excluded from the sale and will be sold only to a state-owned oil and gas firm.