DEVELOPING STORY

*Nymex Crude Settles Down $1.88, or 4.2%, at $43.08/Bbl

*US Oil Plunges to Six-Year Low

*Drop in China's Currency Raises Fears of Sluggish Oil Demand

More to come

Earlier:

U.S. oil has fallen below its lowest settlement price from the past six years as China's decision to devalue its tightly controlled currency is spreading pessimism among investors about China's ability to help soak up a world-wide glut of crude.

The move would make China's imports of dollar-priced commodities such as oil more expensive, analysts said. The yuan registered its biggest one-day loss in two decades following the central bank's decision.

The currency devaluation could hurt demand in the world's second-biggest petroleum consumer at a time when oil prices are already trading near their lowest levels for the year, analysts said.

"It...suggests that the Chinese economy is still struggling to move out of its slowing pattern and into a growth spurt," Dominick Chirichella, analyst at the Energy Management Institute, said in a note. "Overall it continues to suggest that the main oil growth engine of the world is not going to come to the rescue of the oversupplied global oil market anytime soon."

Light, sweet crude for September delivery fell $1.88, or 4.2%, at $43.08 a barrel on the New York Mercantile Exchange, near four-month intraday lows. U.S. oil set a six-year low closing price at $43.46 a barrel on March 17 and has traded as low as $42.03 this year.

Brent, the global benchmark, fell $1.56, or 3.1%, to $48.85 a barrel on ICE Futures Europe. Brent, while also nearing a six-year low, is still more than $2 a barrel above it.

The Organization of the Petroleum Exporting Countries, responsible for more than a third of world's oil supply, also said Tuesday that its members raised their collective output to the highest level in three years in July. OPEC's output increased by 101,000 barrels a day to 31.5 million barrels a day last month, the oil cartel said in its monthly report.

OPEC had just a day ago played a role in a small recovery for oil prices, which saw Brent jump 3.7%. Many had speculated the cartel was planning an emergency meeting to respond to low oil prices.

High oil output from the U.S. and some of the world's biggest petroleum producers, coupled with concerns about an economic slowdown in China, have hit investor sentiment in recent weeks. Oil prices plunged into a bear market last month and are off more than 50% from last year.

Even though official data suggest U.S. oil output peaked in March, it has been at near multi-decade highs, at around 9.5 million barrels a day. As other major global suppliers such as Saudi Arabia and Russia have been pumping crude at a record pace—and with Iran likely seeing a ban on its exports ending soon—there are few signs that the global oversupply of oil will abate in the near future.

Investors believe that U.S. producers can sustain their near-record pace and that global exporters will also be pushing to mitigate any declines, analysts at Credit Suisse Group AG said Tuesday. Those investors appear to have lost confidence that demand growth can keep up and have been selling off long-dated futures, leading to the recent steep decline in front-month prices, Credit Suisse said.

"That is a warning flag—a death canary if you want to go that route," Jan Stuart, the bank's global energy economist said in a conference call.

Later on Tuesday, the American Petroleum Institute, an industry group, will release its data for the U.S. oil inventory levels followed by the official report by the U.S. Energy Information Administration on Wednesday, which will also report on the U.S. weekly oil output.

"U.S. production remains near the highest level in four decades, although the commodity price is telling the U.S. shale sector to shrink, " OPEC said in its report. The higher output is largely due to increased cost efficiencies, lower taxes and existing projects coming on stream, it added. The group said that, for example, in North Dakota, many projects can still be profitable at $24 to $41 a barrel.

OPEC forecasts U.S. output to rise this year by nearly a million barrels a day and another 320,000 barrels a day in 2016.

While many are concerned Tuesday about whether global demand can keep up, the technical aspects of how currencies affect oil prices are likely an even bigger factor in oil's slide, said Hamza Khan, head of commodity strategy at ING Bank in Amsterdam. The dollar's rise in the past year has played a big role in oil's concurrent decline because oil is priced in dollars and becomes more expensive for holders of other currencies as the greenback appreciates. Oil usually goes down when the dollar goes up. The Wall Street Journal's dollar index recently traded up 0.4% on the day.

"People are thinking that China's currency (decision) could open a currency war, which could make the dollar even stronger," Mr. Khan said.

Gasoline futures traded down 1% at $1.6775 a gallon. Diesel futures fell 2.5% to $1.5523 a gallon.

Benoî t Faucon contributed to this article.

Write to Georgi Kantchev at georgi.kantchev@wsj.com and Timothy Puko at tim.puko@wsj.com

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