Indian refiners are going shopping as far as North and South America, buying some crude grades for the very first time, as the world’s third-largest oil importer looks to diversify its oil imports away from the Middle East. India’s HPCL-Mittal Energy Ltd, a joint venture of state-run Hindustan Petroleum Corporation and steel tycoon Lakshmi Mittal, has bought the country’s first-ever crude oil cargo from the newest oil-producing nation, Guyana, a source familiar with the plan told Reuters this week. Mangalore Refinery and…