SINGAPORE, Feb 13 (Reuters) - Abu Dhabi National Oil Company's (ADNOCs) benchmark grade, Murban, was valued at a slight premium on Monday as traders started discussing April loading cargoes. Traders said they did not believe any deals were made, but they expect to see transactions booked at premiums ranging from 0 to 5 cents to the ADNOC official selling price (OSP). "If gas oil falls further this week, we might see sellers lowering their offers into low single digit premiums, and deals could take place at parity," a trader said. Asia's gasoil market eased on Monday, with the prompt February/March timespread falling to its weakest in more than three weeks on lacklustre demand in the region. Sentiment weakened as buying interest from Vietnam, Indonesia and the Philippines slowed. In the Philippines, domestic demand for February shrank following last week's earthquake. * EFS - Front-month Brent/Dubai Exchange of Futures for Swaps (EFS) for March DUB-EFS-1M eased 8 cents to $2.97 a barrel. * OMAN ASSESSMENTS - April Oman traded on the DME was valued at a premium of $2.08 cents to Dubai swap quotes at 0830 GMT, using the settlement price for DME futures, the ICE one-minute marker for Singapore and the Brent-Dubai EFS as calculated by Reuters. * MARKET NEWS - Indian Oil Corp (IOC), the country's largest refiner, has issued a rare tender to buy heavy crude for April lifting from several regions including South America, Africa and the Middle East, tender documents showed on Monday. - Iran has built up its naval forces in the Gulf and prepared boats that could be used in suicide attacks, but the U.S. Navy can prevent it from blocking the Strait of Hormuz, the commander of U.S. naval forces in the region said on Sunday. - France's electricity bills will rise less over the next two decades if it continues to rely on nuclear power for its energy needs, a government-commissioned report showed on Monday, two months ahead of the country's upcoming presidential election. - Sudan and South Sudan on Friday signed a security agreement which aims to defuse tensions over oil payments which officials had warned could spark a war between the two countries. - Total should not sign oil deals with the Kurdistan region without Iraq's approval, Deputy Prime Minister for Energy Hussain al-Shahristani said on Sunday, warning the French major would bear the "full consequences" if it did. * REFINERY MARGINS - The complex refining margin for Dubai in Singapore was $8.97 per barrel, down from an average of the last five days of $9.85, Reuters data show. Over the last year, the average margin has been $8.16 cents per barrel. * CRACK SPREADS - Fuel oil's March crack was weaker at a discount of $3.53 a barrel to Dubai crude. - Gasoil's March crack eased 20 cents to a premium of $17.51 a barrel to Dubai crude. - Naphtha's front-month crack strengthened 26 cents to a discount of $5.25 a barrel to Brent crude. * OUTRIGHT PRICES - March ICE Brent was at $118.25 a barrel by 0830 GMT, up 46 cents from the previous session. - April Oman was trading at $117.36 by 0830 GMT, up 71 cents from the previous session.

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