* Firmer dollar piles pressure on oil prices
* Analysts see upside risk from Iran's election row
* G8 wants measures to curb oil price volatility
By Chua Baizhen
SINGAPORE, June 15 (Reuters) - Oil fell below $72 on Monday, retreating further from eight-month highs as the dollar rose, although traders kept a close watch on Iran where contested election results sparked a weekend of violent protests.
The dollar rose broadly on Monday, cutting into the commodity purchasing power of buyers using other currencies, as investors took profits on non-dollar currencies that had climbed to multi-month highs. [
]U.S. crude <CLc1> fell 44 cents to $71.60 a barrel at 0247 GMT, and London Brent crude <LCOc1> dipped 39 cents to $70.53.
"I would say the dollar is probably the driver... but I have to say I am surprised that (the Iran situation) didn't drive the market up," said Clarence Chu, a trader at U.S.-based Hudson Capital Energy in Singapore.
Supporters of Iran's defeated presidential candidate plan a rally in Tehran on Monday to protest against the re-election of Mahmoud Ahmadinejad, which has sparked two days of violent protests in the capital. [
]Former Prime Minister Mirhossein Mousavi has appealed to the Islamic Republic's top legislative body to annul Friday's election result, in which hardliner Ahmadinejad took 63 percent of the vote.
"The Iranian situation would be bullish. It's another round of geopolitical risk to consider, if it leads to instability in Iran," said Tony Nunan, risk manager at Mitsubishi Corp in Tokyo.
Iran is the world's fifth-largest oil producer and its coastline flanks the Strait of Hormuz, a choke point at the southern end of the Gulf through which around 40 percent of the world's seaborne oil trade passes.
Oil prices, which fell from a peak near $150 a barrel last July to the low-$30s late last year, have been buoyed recently by hopes of economic and demand recovery.
But some analysts, including the International Energy Agency, have warned that the recent price rally to the highest settlement since Oct. 20 last Thursday, may not reflect market balances and may hurt recovery efforts.
French Economy Minister Christine Lagarde said G8 ministers wanted measures to curb volatility in oil and oil products markets, which put at risk growing signs that their economies were heading towards recovery. [
]Iraq's oil minister said an oil price of $70 a barrel is encouraging producers to bring more crude to market but is not enough to balance supply with demand in the event the world economy recovers quickly. [
]"If there is a quick recovery of the world economy, oil prices of $70 will not be enough to balance produced crude and demand and prices will continue rising," Hussain al-Shahristani told Reuters.
Algeria's Energy and Mines Minister Chakib Khelil said global oil markets could stabilise if crude prices rise to around $90 a barrel and that is likely to happen in the second half of 2010. [
] (Editing by Michael Urquhart)