New York's main contract, light sweet crude for January, fell to US$83 while Brent North Sea crude for delivery in January settled at US$85.17 in London trade. The last day of the previous week saw oil prices fall as the dollar strengthened vs the euro on deepening concern over the eurozone debt crisis. However, trade was lackluster after the US Thanksgiving holiday. The euro tumbled close to 1.32 dollars, dropping to a fresh two month low. The dollar strengthened on worries about eurozone debt and Korea boosted the US unit.