Profit in July-September fell to Rs 236 crore from Rs 1,185 crore in the same period last year, MRPL said in a press statement here.
MRPL, a subsidiary of state-owned Oil and Natural Gas Corp, earned $5.04 on turning every barrel of crude oil into fuel compared with a gross refining margin of $9.19 per barrel in Q2 of 2012-13.
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Also, the company lost Rs 249 crore in the three-month period due to foreign exchange rate fluctuations compared with a Rs 284 crore gain a year earlier.
Turnover rose 14% to Rs 19,554 crore on the back of a 38% surge in exports. Overseas sales rose to Rs 10,288 crore from Rs 7,474 crore.
In volume terms, the company exported 23% more fuel at 1.91 million tons in Q2 of the current fiscal.
The company processed 3.69 million tons of crude oil in the quarter, marginally higher than 3.59 million tons a year ago.
In the April-September period, MRPL reported a net loss of Rs 218 crore compared with Rs 335 crore in the corresponding period a year earlier.
Refining margins for the six-month period were up 27% to $3.98 per barrel.
Turnover increased to Rs 35,688 crore from Rs 30,613 crore, primarily due to a 28% jump in exports to Rs 17,216 crore.
In volume terms, exports rose 19% to 3.46 million tons in the first half of the current fiscal.