CNBC | US oil settles at $36.50 a barrel, down $1.40, or 3.7 pct CNBC U.S. oil prices sank 3.7 percent on Tuesday after Goldman Sachs suggested the recent rally was unsustainable and as analysts expected another U.S. stockpile build. Comments from Goldman Sachs analysts that poured cold water over the prospects for a ... Oil down 3 percent; rally snaps on supply worry, Goldman caution Oil retreats as rally snaps on supply worry Oil prices edge lower in volatile trade while commodity prices rally is unsustainable |