* U.S. jobless claims data due Thursday
* U.S. crude stock data higher than expected
* Russia gas row, MidEast violence, OPEC cuts in support
(Updates prices, changes dateline, previous SINGAPORE)
By Chris Baldwin
LONDON, Jan 8 (Reuters) - Oil traded slightly down on Thursday, testing $43 after diving 12 percent overnight partly due to higher than expected U.S. crude stocks data that hardened evidence of weakening demand.
U.S. crude for February delivery <CLc1> was down 21 cents at $42.42 a barrel by 0949 GMT, after sinking 12.3 percent to $42.63 overnight, its biggest one-day percentage loss since Sept. 24, 2001.
London Brent crude <LCOc1> was up 2 cents at $45.88.
The market will be watching for weekly U.S. jobless claims due later in the day, and December non-farm payroll and unemployment data on Friday, expected to be dismal, for clues on future demand.
U.S. Energy Information Administration (EIA) data showed crude stocks up 6.7 million barrels, more than seven times the 900,000-barrel increase analysts expected. [
]"(Wednesday's) data reinforced our opinion that the weak global oil demand argument is still very much alive and well," Jim Ritterbusch, president of Ritterbusch & Associates, wrote in a commentary.
Wednesday's bearish reading on private sector payrolls from ADP Employer Services signalled more weakness to come in Friday's fuller U.S. Labor Department employment report.
ADP's data showed private employers shedding 693,000 jobs in December, up from 476,000 jobs in November and far more than economists estimated. [
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JOBLESS
The Labor Department will also release weekly first-time claims for jobless benefits later on Thursday. Economists in a Reuters survey forecast a total of 540,000 new filings compared with 492,000 in the previous week.
Oil has fallen more than $100 from a record peak of over $147 a barrel in July, as the global economic downturn hits demand for fuel. It settled at $33.87 a barrel on Dec. 19, the lowest level since Feb. 10, 2004.
However, prices are getting some support from violence in Gaza, widening natural gas supply disruptions due to a row between Russia and Ukraine, and mounting evidence of OPEC's compliance with production cuts.
Three rockets fired from Lebanon struck northern Israel on Thursday, slightly wounding two people and prompting the Jewish state to respond with artillery fire, officials said. It was not immediately clear who fired the rockets. [
]While the conflict does not directly threaten any oil supplies, Middle East unrest can bolster prices because countries in the region pump about a third of the world's oil.
Russia and Ukraine will argue their case to Europe on Thursday in a gas price dispute that is choking off gas flows to European countries. [
]The dispute has cut heating to tens of thousands of households in Bulgaria and hit supplies as far west as France and Germany as Europe faces freezing temperatures.
Signs that members of the Organization of the Petroleum Exporting Countries (OPEC) are implementing the group's biggest-ever output cuts grew this week after Kuwait and Iran told customers of bigger January supply curbs. [
] (Additional reporting by Jennifer Tan in Singapore, editing by Sue Thomas)