South Korean stocks finished marginally lower Tuesday as blue-chip tech gains were offset by losses among oil refiners, analysts said. The local currency climbed against the U.S. dollar. After bobbing in and out of positive territory, the benchmark Korea Composite Stock Price Index (KOSPI) shed 0.01 percent, or 0.27 points, to 2,130.21. Trading volume was moderate at 299 million shares worth 6.05 trillion won (US$5.7 billion) with gainers leading losers 462 to 345.