* Dollar off record low vs euro on oil price slide
* US financial sector woes seen hurting dollar longer term
* Speculators looking to sell dollar/yen below Y105
* Japan margin traders boost dollar long positions
By Shinichi Saoshiro
TOKYO, July 16 (Reuters) - The dollar rose against the euro on Wednesday after sliding to a record low the previous day, with a sharp drop in oil prices helping to temporarily offset mounting gloom over the U.S. financial sector.
Investors battered the dollar to a record low against the euro the previous day as fears reached fever pitch after the U.S. government was forced to come up with a rescue plan for mortgage lending giants Fannie Mae <FNM.N> and Freddie Mac <FRE.N>, just as one of the country's biggest mortgage banks collapsed.
In addition, Federal Reserve Chairman Ben Bernanke did the dollar no favours when he said that restoring stability to the hard-hit financial sector was his top priority, suggesting that any potential interest rate hikes to contain inflation won't be coming soon.
But the dollar came off its lows against the euro and the yen as crude oil's biggest price plunge since the 1991 Gulf War briefly shifted investors' attention away from troubles in the U.S. financial sector and economy.
Oil was little changed in Asian trade at just below $139 a barrel <CLc1>.
"Bernanke placed top priority on returning the U.S. financial sector back to normal, which further pushed back rate hike expectations," said Hideaki Inoue, chief manager of forex trading at Mitsubishi UFJ Trust Bank.
"But the dollar was not sold as much as otherwise possible thanks to the lower oil prices," Inoue said.
The euro fell 0.2 percent from late U.S. trade to $1.5886 <EUR=>, having pulled back from a record high of $1.6040 hit on trading platform EBS the previous day.
The dollar eased 0.1 percent to 104.51 yen <JPY=>, up from a six-week low of 104.16 yen struck on Tuesday as it plummeted 1.5 percent -- the biggest one-day tumble since the collapse of Bear Stearns on March 17.
Traders said the dollar's slide below the 105 yen threshold was a key psychological break that could prompt speculators to try to push it even lower.
But currency day-traders in Japan saw the dollar's drop below 105 yen as a buying opportunity.
Data from the Tokyo Financial Exchange showed traders boosted their dollar-long positives by the second biggest one-day amount in records going back to mid-2006.
Traders who make leveraged bets with margin accounts are known for buying higher-yielding currencies on any sharp pull-back, then selling when such currencies rebound against the low-yielding yen.
OIL AND THE DOLLAR
Analysts expect the dollar's rebound from falling oil prices to be fleeting.
"The dollar received a reprieve because the fall in oil was so visible," said Masafumi Yamamoto, head of foreign exchange strategy for Japan at Royal Bank of Scotland.
"But from a longer-term perspective, the dollar has been shown to be less correlated to oil prices compared with the euro. Therefore the dollar does not need to be seen in very close conjunction with oil market trends."
On Tuesday, Bernanke told the Senate Banking Committee that financial markets and institutions remained under "considerable stress" and restoring stability was a top priority. Bernanke will speak at the House of Representatives later in the day. [
]Later, U.S. Treasury Secretary Henry Paulson told the committee that distressed mortgage lenders Fannie Mae and Freddie Mac had the potential to pose systemic risks to the financial system. [
]The Australian dollar slipped after Reserve Bank of Australia Governor Glenn Stevens said interest rates could fall before inflation came back within the central bank's target band, just as it was often necessary to raise them before inflation climbed above the band. [
]The Aussie was down 0.3 percent at $0.9760 <AUD=D4> on the Reuters dealing system, pulling back from an earlier high of $0.9815 that took the high-yielding currency back near a 25-year peak of $0.9851 struck on Tuesday. (Additional reporting by Eric Burroughs; Editing by Michael Watson)