By Nicole Friedman 

NEW YORK--Oil prices slid Friday as the dollar strengthened and the closely watched U.S. oil-rig data showed another slight decline.

Light, sweet crude for July delivery recently fell $1.07, or 1.7%, to $59.65 a barrel on the New York Mercantile Exchange. Brent, the global benchmark, fell $1.17, or 1.8%, to $65.37 a barrel on ICE Futures Europe.

Moves in the oil price have closely tracked the dollar in recent weeks, with some analysts attributing nearly all of a recent rally in oil prices to a weakening in the dollar. The global crude market remains oversupplied, and some analysts warn that the rally was unsustainable and oil prices are likely to slump from current levels later this year.

The dollar rose Friday after the Labor Department said that U.S. consumer prices rose for the third straight month in April. The WSJ Dollar Index, which tracks the greenback against other major currencies, recently rose 0.6%.

A strong dollar makes oil, which is priced in dollars, more expensive to foreign buyers.

"We continue to emphasize the importance of daily U.S. dollar swings as a significant driver of oil pricing," said energy-advisory firm Ritterbusch Associates in a note.

Analysts also anticipate strong U.S. driving demand during the Memorial Day weekend holiday, the unofficial start to the summer-driving season. U.S. driving has picked up in recent months due to cheaper gasoline and a strengthening economy.

Retail prices at the pump are at the lowest level for this time of year since 2009.

In addition, the release of the latest U.S. oil drilling rig count--a proxy for activity in the industry--showed a drop of just one rig over the past week, the smallest of the 24-week steak of declines.

There are now about 59% fewer rigs working since a peak of 1,609 in October. The rate of decline, however, has slowed in recent weeks and some shale oil companies are expecting to add rigs in the coming months if prices stabilize near the current levels.

"The current price levels may keep some players in business and even entice others to come back," analysts at JBC Energy said in a report. "The first plays to rise from the dead and post further growth could be in the U.S. and. such a turn of events could keep production up."

Gasoline futures recently fell 2.3% to $2.0354 a gallon. Diesel futures fell 1.9% to $1.9485 a gallon.

Georgi Kantchev

contributed to this article

Write to Nicole Friedman at nicole.friedman@wsj.com

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