Mumbai: Reliance Industries Ltd is set to sell a 20 per cent stake in its oil to chemicals business to Saudi Aramco in one of the largest foreign investments in the country, Reliance Chairman Mukesh Ambani said on Monday. “(This is) the biggest foreign investment in the history of Reliance,” Mr Ambani said at the company’s annual general meeting in India’s financial capital Mumbai. “It is also amongst the largest foreign investments ever in India.” The deal valued the business at $75 billion including debt, he said. Saudi Aramco, the world’s biggest oil producer and will also supply 500,000 barrels a day of crude oil on a long-term basis to RIL’s Jamnagar refinery, Mr Ambani said. “This signifies perfect synergy between the world’s largest oil producer and the world’s largest integrated refinery and petrochemicals complex,” he added. The partnership will cover all of Reliance’s refining and petrochemical assets, including its 51 per cent stake in the petroleum retail joint venture, he said. Last week, Reliance announced that it was forming a fuel retailing joint venture with global oil major BP in which Reliance would own a 51 per cent stake.