KARACHI : Pakistan State Oil, the country’s largest oil marketing company, on Wednesday sought Rs30 billion from the government on urgent basis in view of fast-depleting furnace oil stock. According to company sources, the firm has only five-to-seven-day stock of the furnace oil, which is primarily used to generate electricity.  To import furnace oil, the company has requested the government to release additional Rs30 billion for the purpose of maintaining sufficient inventory and smooth supply. But petroleum ministry sources said that the government released Rs20 billion for PSO just last week. PSO receivables have touched whopping Rs172 billion, company sources said.