* Dollar index hits lowest since Sept. 2008
* Oil's push higher mirrors rise in equity markets
* Rockets fired on Israel prompts crude buying-traders
(Updates prices, quotes, background)
By Catherine Bosley
LONDON, Sept 11 (Reuters) - U.S. crude oil rose above $72 a barrel in choppy trade on Friday, building on three sessions of gains and lifted by a weaker dollar.
U.S. crude for October delivery <CLc1> was up 62 cents at $72.56 a barrel by 1338 GMT. London Brent crude <LCOc1> was up 65 cents at $70.51 a barrel.
"The environment at the moment is probably relatively positive. It's not just the equity market and the dollar but you have also some oil-specific fundamentals," Commerzbank analyst Eugen Weinberg said. News that at least two rockets were fired from southern Lebanon into northern Israel heighted fears over regional stability and prompted crude buying, traders said.[
]"But the market needs at some point to take a step back and ask whether these kinds of fundamentals are really supportive of these kinds of prices," Weinberg also said.
Oil hit a year-high of $75 a barrel in late August, from below $33 a barrel in December, as global oil demand recovered.
Crude's climb mirrored a rise in European equities <
>, which were headed for their sixth consecutive session of gains.Since March 9, equities and oil have traded in close correlation. For a graphic see:
http://graphics.thomsonreuters.com/099/CMD_BRNT20909.gif
Prices were also supported by the International Energy Agency's expectation that oil demand would rise this year and next as the global economy recovers, although it also said oil stocks in the big developed countries of the OECD were up 4.6 percent in July versus a year ago. [
]DOLLAR WEAKNESS
The dollar index <.DXY>, a measure of the U.S. unit's performance against six other major currencies, has dropped 1.9 percent in the past week, and on Friday it briefly fell as low as 76.548, its lowest since September 2008. [
]A weak dollar, the currency of the oil market, was a concern for the Organization of the Petroleum Exporting Countries, and the group needed higher average oil prices to step up investment in new output, its secretary-general said. [
]The dollar's slide has helped boost demand for crude this week, but an analyst at Commonwealth Bank said oil was unlikely to get much more upward momentum from the greenback.
"Our forecast for currencies is for dollar depreciation -- a lot of that has occurred already and while depreciation has been an upside driver, that influence may be weakening," said David Moore, commodities strategist at Commonwealth Bank in Sydney.
The Energy Information Administration reported on Thursday that U.S. crude inventories fell by more than expected last week. But inventories of gasoline and middle distillates rose, and analysts said the oil products supply build likely would offset the impact of the crude draw. [
](Additional reporting by Nick Trevethan in Singapore; editing by Keiron Henderson)