Reuters Market Eye - Shares of state-run oil marketing companies gain sharply as global crude prices hit multi-year lows.
Traders say fall in global crude prices could help them improve margins.
Brent crude drops further below $83 a barrel, stretching losses into a fifth session.
Indian Oil Corp gains 2.2 percent, Hindustan Petroleum Corp adds 2.4 percent and Bharat Petroleum Corp is up 1.9 percent.
(Reporting by Indulal PM)