** Shares of U.S. refiner Phillips 66 PSX.N down 2.6% at $102.99 premarket
** Co reports bigger-than-expected loss in Q1, hurt by lower refining margins
** Q1 adj. loss was 90 cents/shr vs estimate of a loss of 72 cents/shr - data compiled by LSEG
** Q1 refining margins fell 38% to $6.81/bbl and turnaround expenses rose over twofold to $270 mln
** As of last close, PSX down 8.5% YTD
(Reporting by Sumit Saha in Bengaluru)
((Sumit.Saha@thomsonreuters.com;))