SINGAPORE, April 16 (Reuters) - The 180-cst fuel oil crack spread to Dubai crude widened to a more than four-month low on Wednesday, as abundant supplies continued to pressure the market which has seen thin demand for the heavy distillate.     The price difference between a barrel of May-loading fuel oil to Dubai crude stood at a discount of $13.39 a tonne, down nearly 10 percent from Tuesday, Reuters data showed.  
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       The 380-cst June/July spread also widened by $1.50 a tonne to a discount of $2 a tonne.     "I think people are finally coming to grip with the fact that demand is poor, arbitrage supplies are not coming down," said a Singapore-based trader.     At least 4 million tonnes of fuel oil are expected to land in Asia in April and May, trade sources and Reuters analysis of shipping data showed.     More than 3.6 million tonnes of the heavy distillate will arrive in Singapore for both months - at least 10 percent higher than the bunker fuel sales since February.     Singapore marine fuel sales fell for the third straight month to a 13-month low in March, despite a rebound in vessel arrivals for bunkering, according to data from the Maritime and Port Authority of Singapore (MPA).  
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       Japan's low sulphur fuel oil stocks rose for the second straight week to 0.82 million kiloliters in the week to April 12, up 10.6 percent from the week before, data from the Petroleum Association of Japan showed.     Refinery utilization rates rose marginally to 84.7 percent, from 84 percent the week before.           *CASH DEALS     No trades were reported.          *MARKET NEWS     China's implied oil demand fell 0.6 percent in the first quarter as a slowing economy dampened energy use, forcing refiners to scale back crude runs and raise exports to trim high fuel stocks. China's economy grew at its slowest pace in 18 months in the first quarter of 2014, official data showed on Wednesday, with signs of waning momentum already prompting limited government action to steady the world's second-largest economy.  
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         FUEL OIL                                                                             CASH ($/T)          ASIA CLOSE       Change   % Change   Prev       RIC                                                           Close        Cargo - 180cst               599.70    -0.52      -0.09     600.22   
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    Diff - 180cst                 -2.85    -1.00      54.05      -1.85   
  FO180-SIN-DIF
    Cargo - 380cst               590.50    -0.81      -0.14     591.31   
  FO380-SIN
    Diff - 380cst                 -3.05    -0.05       1.67      -3.00   
  FO380-SIN-DIF
    Bunker (Ex-wharf)-           592.00    -0.50      -0.08     592.50   
  BK380-B-SIN
    380cst                                                                Bunker (Ex-wharf)              1.50     0.31      26.05       1.19                   Premium                                                                                                                                                    For a list of derivatives prices, including margins,                                 please double click the RICs below.                                   Brent M1             
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                                                       180cst M1            
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                                                     180cst M1/M2         
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                                                     180cst M2            
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                                                     Visco M1             
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                                                     Visco M2             
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                                                     380cst M1            
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                                                     380cst M1/M2         
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                                                     380cst M2            
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                                                     Cracks 180-Dubai     
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                                                     M1                                                                    Cracks 180-Dubai     
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                                                     M2                                                                    East-West M1         
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                                                        East-West M2         
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                                                        Barges M1            
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                                                      Barges M1/M2         
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                                                     Barges M2            
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                                                      Crack Barges-Brent   
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                                                     M1                                                                    Crack Barges-Brent   
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                                                     M2                                                                      (Reporting by Jane Xie, editing by William Hardy)  ((jane.xie@thomsonreuters.com)(+65 6870 3495)(Reuters Messaging: jane.xie.thomsonreuters.com@reuters.net))  Keywords: MARKETS ASIA/FUELOIL