NEW YORK - Standard & Poor's Ratings Services on Monday placed the ratings of oil refiner Frontier Oil Corp. on review for possible upgrade, citing the oil refiner's low debt and consistent operating performance.
The ratings service placed Frontier Oil on CreditWatch with positive implications, meaning it has a one in two chance of being upgraded in the next three months.
S&P currently has a corporate credit rating of "BB-" for Frontier.
Frontier shares fell 77 cents to $70.47 in afternoon trading.

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