LONDON:– Oil surged above $30 on Friday after the European Central Bank signalled more stimulus, and after key crude producer Saudi Arabia labelled current ultra-low price levels as "irrational". However, analysts expect the stubborn global oil supply glut -- which sparked this week's 12-year lows -- to limit gains heading into the weekend.In London midday deals, Brent North Sea crude for delivery in March rebounded $1.61 to $30.86 per barrel compared with the close on Thursday.–AFP