* Most-traded U.S. oil contract and Brent stronger
* Front US futures contract hits 4-1/2-year low, then rises
* Saudi Arabia pledges output cut from January
(Recasts)
By Christopher Johnson
LONDON, Dec 19 (Reuters) - Oil ticked up on Friday, recovering from an early sell-off as hopes of declining production by the world's major oil exporters outweighed fears of global economic slowdown and its impact on oil demand.
U.S. light crude for February rose $0.16 a barrel to $41.83 at 1559 GMT. The contract for January delivery <CLc1>, which was due to expire later on Friday, fell to $33.44, its lowest since April 2004, before recovering a little to $34.90 by 1559 GMT.
London Brent crude <LCOc1> was trading $0.20 up at $43.56.
Oil prices have fallen more than $100 from their peak above $147 in July and looked set for one of their biggest weekly declines for years.
Oil dropped this week despite pledges by the Organisation of the Petroleum Exporting Countries (OPEC) to remove 2.2 million barrels per day (bpd) from its supply, the largest ever reduction by the producer group.
But many traders doubt OPEC, whose third production cut since September has brought its total reduction to more than 4 million bpd or 5 percent of world supply, will fully implement the agreed cuts, further weighing on prices.
"We believe that full implementation of the cuts is unlikely," Goldman Sachs analysts said in a note to clients.
OPEC kingpin Saudi Arabia's Oil Minister Ali al-Naimi, speaking in London, said on Friday the kingdom would be pumping less oil in January and would be at its new output target in line with the group's latest cut.
"BITE THE BULLET"
That reassurance appeared to be having some impact on the market in late European trade on Friday.
"From a credibility standpoint, OPEC has no choice but to bite the bullet for the next few months," said Jonathan Kornafel, Asia Director of Hudson Capital Energy, but added:
"Until traders see a sustained drop-off in the rate of demand destruction, the market will have a hard time establishing a floor."
OPEC President Chakib Khelil said on Friday he believed oil prices had found a floor around current levels.
"I don't believe there is any reason for it to fall any further. I don't see it going lower," he told Reuters in London.
Gene McGillian, analyst at Tradition Energy in Stamford, Connecticut, said the market was beginning to reflect the latest move by OPEC oil exporters, at least on the February futures contract.
"The market is signalling that it is taking a look at the OPEC cut and recognising that is more likely to be evident in February," he said.
But nearby U.S. futures came under severe pressure ahead of its expiry later on Friday. U.S. traders said the January futures contract was under unusually strong pressure.
"It seems to be all about the expiration today," said Peter Beutel, president, Cameron Hanover, New Canaan, Connecticut. "It seems that a lot of the trading we're seeing today is selling January and buying a back month like February or March." (Reporting by Christopher Johnson; editing by Sue Thomas)