March delivery was up 26 cents at $85.07 for a barrel Benchmark crude, at Singapore time in electronic trading on the New York Exchange. The contract fell 77 cents to land at $84.81 .
On the ICE Futures exchange in GB, London, Brent crude for April delivery gained 28c to $103.36/barrel .
Pro-democracy protesters battled police in Tehran on Monday, emboldened by the protests in Egypt that forced President Hosni Mubarak from power last week. There have also been anti-government protests in Bahrain, Yemen and Algeria while mass demonstrations helped bring down Tunisia’s long-time ruler Ben Ali earlier this year.
In the Organization of Petroleum Exporting Countries behind Saudi Arabia Iran is the second-largest oil exporter