OIL prices closed steady on Monday as dealers awaited fresh signals from Opec on its policy for output when an agreement on supply curbs expires at the end of the month. London Brent futures last traded up one cent at $28,95 a barrel and US light crude was up 26 cents at $32,02. Traders want to know exactly how much extra supply Opec and its non-Opec ally Mexico have in mind but officials in producing countries say negotiations still have reached no decision.