UPDATE 1-Frontier Oil posts wider-than-expected Q3 loss

* Q3 adj loss $0.19/shr vs est loss $0.15/shr

* Revenue down 45 percent

Nov 5 (Reuters) - Oil refiner Frontier Oil Corp (FTO.N) posted an adjusted quarterly loss that was wider than market estimates as refining margins and demand continued to remain weak. Refined product margins remained depressed during the third quarter due to continued weak demand and sustained high inventory levels, particularly distillates, the company said in a statement.

Net loss for the quarter was $15.1 million, or 15 cents a share, compared with net income of $72.3, or 70 cents a share, in the year-ago quarter.

Excluding items, the company's loss for the quarter was 19 cents a share, while analysts were expecting a loss of 15 cents a share, according to Thomson Reuters I/B/E/S.

Revenue fell 45 percent to $1.20 billion. Analysts were expecting revenue of $1.26 billion.

Shares of the company closed at $13.80 Wednesday on the New York Stock Exchange. (Reporting by Hezron Selvi in Bangalore; Editing by Himani Sarkar)