Net profit in October-December of this fiscal came in at Rs 3,056.86 crore against a net loss of Rs 2,636.80 crore, IOC Chairman B Ashok told reporters here.
"The profit is mainly because of lower inventory losses, besides performance improvement," he said.
The company's inventory loss came down to Rs 4,477 crore in October-December 2015, from Rs 12,840 crore in the previous fiscal.
Inventory losses arise when the company buys oil at a price, but by the time it ships crude to India and processes the same into fuel, the rates would have fallen, lowering the value of the inventory.
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Excluding inventory losses, GRM in October-December should have been USD 10.97 per barrel as against USD 10.47 a year ago.
Finance cost came down to Rs 611 crore in the third quarter, from the Rs 929 crore earlier, he said.
IOC refineries processed 4.5 per cent more crude oil at 14.424 million tonnes while sales rose 3.7 per cent to 19.10 mt.
"Broadly, there are 2-3 key elements. We have done well on all physical parameters -- refinery throughput is up, pipeline throughput has increased and sales have been higher," he said.
IOC's borrowing came down to Rs 49,120 crore as on December 31, 2015 as against Rs 55,000 crore at the beginning of the fiscal.
Turnover decreased from Rs 1,07,983.75 crore for the quarter ended December 2014 to Rs 84,111.87 crore for the quarter to December 2015 because of a fall in global oil rates.