(Updates prices, previous SINGAPORE)
LONDON, June 13 (Reuters) - Oil steadied above $136 a barrel on Friday after volatile trading in the previous session spurred by threats to supplies from Nigeria, the world's eighth-largest oil producer.
U.S. crude oil <CLc1> was 32 cents down at 136.32 a barrel by 0915 GMT, within sight of last week's record $139.12. It recouped a $4 fall on Thursday, ending 36 cents higher at $136.74 a barrel, after concerns emerged about a possible strike in Africa's top oil producer.
Brent crude <LCOc1>, whose July contract expires later in the day, was down 44 cents at $135.65 a barrel.
Nigeria's senior oil workers' union, which wants the expatriate managing director of Chevron's <CVX.N> local unit to be transferred out of the country, said on Thursday talks to avert a lockout were not going well and renewed its strike threat. [
]."Certainly, we're worried about Nigeria, we're still very mindful of the situation," said Peter McGuire, managing director of Commodity Warrants Australia.
A strike would further dent oil output in Nigeria, where a fifth of capacity has already been shut since early 2006, when militants in the Niger Delta began a violent campaign of sabotage against oil installations.
Analysts say Chevron produces around 350,000 barrels a day out of Nigeria, which could be hit in a strike.
"We suspect we will be closing on a firmer note today, as we doubt participants would want to head home net short going into the weekend. If there is going to be a correction coming, it will most likely have to wait until next week," said Edward Meir of MF Global.
Oil has risen around 40 percent so far this year, relentlessly boosted by fears of tight supplies, and weakness in the U.S. dollar which has triggered investor buying of commodities as a hedge against inflation.
The dollar, which received a boost on Thursday by surprisingly strong U.S. retail sales data, dipped from a nearly four-month high against the yen on Friday amid profit-taking by investors ahead of a gathering of finance ministers from the Group of Eight nations in Japan this weekend.
Later on Friday, traders will watch U.S. consumer price data for May and real earnings for further signs on the economic health of the world's top oil consumer.
The market will also keep an eye on moves by regulators in the United States and Britain to rein in speculative crude futures trading, which OPEC has said is the main cause of the spikes in oil prices. [
]Iraqi Oil Minister Hussain al-Shahristani reiterated that view on Thursday, saying more crude from Saudi Arabia or other OPEC producers will not solve the problem of high global prices. (Reporting by Baizhen Chua in Singapore and Santosh Menon in London; editing by James Jukwey)