Why one of Asia’s biggest diesel exporter India is buying from offshore

India — one of Asia’s biggest diesel exporters — is having to import large quantities of the industrial fuel as its refineries gear up for new emission rules that take effect in April.

The country imported 293,000 tons of diesel in December, a fivefold jump from November, figures from data intelligence firm Kpler show. However, it remained a net exporter of the fuel. Most of the imports are likely to be ultra low-sulfur grades that comply with the Bharat Stage VI standards, which mandate a maximum sulfur content of 0.001% in fuel for road vehicles.

Indian Oil Corp., the country’s biggest refiner, imported 120,000 tons of diesel last month, said Rakesh Sehgal, executive director of supplies. It will continue offshore purchases until March as some of its refineries are upgraded to produce lower-emission fuels and is looking to import a further 160,000 tons, he said.