WRAPUP 3-Refiners posts profits as improved margins help

* Sunoco, Tesoro, Western Refining swing to profit

* Alon USA also posts profit, CVR's profit jumps 38 pct

* Refining margins up for all companies

* Sunoco and Alon shrs flat in after market trading

* Tesoro shares fall 2.4 percent (Adds Tesoro, Sunoco, and Alon USA's results, previous dateline BANGALORE, changes byline)

By Hezron Selvi and Adveith Nair

NEW YORK/BANGALORE, May 6 (Reuters) - The steep drop in oil prices from last year helped oil refiners Sunoco Inc (SUN.N), Tesoro Corp (TSO.N), Western Refining Inc (WNR.N), and Alon USA Energy Inc (ALJ.N) swing to a quarterly profit as their refining margins improved.

CVR Energy (CVI.N) also posted higher quarterly earnings and beat analysts' estimates aided by better margins. [ID;nBNG102169]

Margins were low last year due to the high benchmark oil prices, BMO Capital Markets analyst Jim Byrne said.