* Oil edges up after nearly 2 percent drop
* OPEC says "willing to go further" to balance market
* Advance U.S. Q4 GDP data seen weakest in 26 years
(Updates prices, changes dateline, previous Singapore)
By Chris Baldwin
LONDON, Jan 30 (Reuters) - Oil firmed modestly on Friday, after a nearly 2 percent fall the previous day, after OPEC said it would cut output further at its March meeting if needed to balance the market.
By 1115 GMT, U.S. crude was up 43 cents a barrel at $41.87, while London Brent crude gained $1.00 to $46.40.
The producer cartel's secretary general told Reuters it was willing to go further to stem oil's $100-a-barrel collapse since July last year.
"If the market is unbalanced, yes we will take measures to balance the market," the Organization of the Petroleum Exporting Countries' Abdullah al-Badri said at the World Economic Forum in Davos, Switzerland on Friday. [
]Analysts said investors would focus on advance U.S. fourth-quarter gross domestic product data on Friday at 1330 GMT, expected to show Q4 GDP down 5.40 percent, its weakest in 26 years.[
]"If they surprise to downside, then the scope for any future price gain is going to be capped, and prices may actually even go lower," said Harry Tchilinguirian, senior oil analyst at BNP Paribas in London.
Asia's outlook was equally bleak. Data showed Japan's unemployment at a near three-year high and industrial output in the world's third-biggest oil consumer plunging a record 10 percent last month [
].
SHRINKING DEMAND
Oil has fallen nearly 11 percent over the past week but is only down 6.8 percent from December, its smallest monthly percentage fall since prices began tumbling off a record high near $150 in June.
On Thursday oil fell 1.7 percent on data showing the U.S. jobless rate rose to a record peak in January, single-family home sales fell in December to their lowest ever and new orders for durable goods tumbled for a fifth straight month.
Shrinking demand for fuel has also contributed to the biggest four-month build-up in U.S. crude stockpiles since 1990.
"You have a tug of war between refiners that are cutting throughputs and OPEC cutting its supply," Tchilinguirian said.
But traders said some support came from a possible strike by 30,000 U.S. refinery workers who threatened on Thursday to shutter more than half of the nation's oil refining capacity, though a top union negotiator expressed optimism a deal could be reached before Sunday's deadline [
].In Britain, energy workers staged unofficial walkouts on Friday when anger over the use of foreign workers at an oil refinery spread to other sites across the country.
Contractors at Total's <TOTF.PA> Lindsey refinery in eastern England began a protest on Wednesday. The dispute spread on Friday, and hundreds walked out at the Grangemouth oil refinery in Scotland run by Ineos Group [
].Total and Ineos have both said production has not been affected. (Additional reporting by Farah Masters; editing by Sue Thomas)