June 8 (Reuters) – India’s Essar Oil, one of Iran’s key Indian clients, has significantly reduced purchases from the santions-hit nation in May and switched to Latin American grades, which accounted for about a third of its overall imports during the month, tanker discharge data made available to Reuters show. Indian refiners cut imports from Iran by 38 percent in May from a year ago, in a second month of steep reductions as they switch suppliers to cushion the impact of tighter western sanctions on Tehran. >>>