SINGAPORE, June 25 (Reuters) - Asia's fuel oil market rebounded slightly on Monday, as buying resumed after the market remaining largely quiet last week.     The cash premium for the 180-centistoke (cst) grade climbed to a four-week high of $5.00 a tonne above Singapore spot quotes. However, the 380-cst premium fell to a 1.5 week low of $3.40 a tonne, as a deal was done at a low premium of $3.00 a tonne above Singapore spot quotes.  
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       The swaps market was more active as well, with close to 200,000 tonnes of the fixed-price contracts changing hands. The prompt July/August intermonth swaps rebounded from a four-session low to a two-sesison high of $5.38 a tonne. At least 100,000 tonnes of the contract was traded.     In the bunker market, the price of ex-wharf marine fuel fell further, hitting a new 17-month low of $568.00 a tonne. However, few deals were done as buyers anticipate prices to drop further, in line with weakening crude prices.     Demand for fuel oil could increase, as Japan's Meteorological Agency predicted average to hotter than usual weather from July to September, which could push up electricity demand in the peak summer season.  
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            In the West, U.S. oil major Exxon Mobil will reconfigure its Fawley refinery in September. The process includes decommisioning a unit that produces fuel oil.  
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             **Cash trades: One 180-cst and one 380-cst deals.      - Vitol sold 22,000 tonnes of 180-cst, for July 10-14 lifting, to Glencore at a premium of $5.00 a tonne to Singapore spot quotes.     - Vitol also sold 20,000 tonnes of 380-cst, for July 10-14 lifting, to PetroChina at a premium of $3.00 a tonne to Singapore spot quotes.       CASH ($/T)              ASIA CLOSE   Change  % Change  Prev     RIC                                                         Close      Cargo - 180cst               574.20    2.50      0.44   571.70   
  FO180-SIN
    Diff - 180cst                  5.00    0.85     20.48     4.15   
  FO180-SIN-DIF
    Cargo - 380cst               562.85    2.05      0.37   560.80   
  FO380-SIN
    Diff - 380cst                  3.40   -0.55    -13.92     3.95   
  FO380-SIN-DIF
    Bunker (Ex-wharf)-           568.00   -2.00     -0.35   570.00   
  BK380-B-SIN
    380cst                                                            Bunker (Ex-wharf)              5.15   -4.05    -44.02     9.20                   Premium                                                                                                                                            SWAPS  ($/T)            ASIA CLOSE   Change  % Change  Prev     RIC                          (0830 GMT)                     Close      Brent M1                      90.42    0.99      1.11    89.43   
  BRENTSGMc1
    180cst M1                    569.63    2.13      0.38   567.50   
  FO180SGSWMc1
    180cst M1/M2                   5.38    0.38      7.60     5.00   
  FO180SGSDMc1
    180cst M2                    564.25    1.75      0.31   562.50   
  FO180SGSWMc2
    Visco M1                       9.75   -1.00     -9.30    10.75   
  FOVISSGDFMc1
    Visco M2                       9.75   -0.38     -3.75    10.13   
  FOVISSGDFMc2
    380cst M1                    559.88    3.13      0.56   556.75   
  FO380SGSWMc1
    380cst M1/M2                   5.38    1.00     22.83     4.38   
  FO380SGSDMc1
    380cst M2                    554.50    2.12      0.38   552.38   
  FO380SGSWMc2
    Cracks 180-Dubai M1           -1.22   -0.60     96.77    -0.62   
  FO180SGCKMc1
    Cracks 180-Dubai M2           -1.99   -0.60     43.17    -1.39   
  FO180SGCKMc2
    East-West M1                  36.50   -1.00     -2.67    37.50   
  FOSGEWMc1
    East-West M2                  36.25    0.00      0.00    36.25   
  FOSGEWMc2
    Barges M1                    533.13    3.13      0.59   530.00   
  HFOFARAAMc1
    Barges M1/M2                   5.13    1.38     36.80     3.75   
  HFOFARAASMc1
    Barges M2                    528.00    1.75      0.33   526.25   
  HFOFARAAMc2
    Crack Barges-Brent M1         -9.19   -0.72      8.50    -8.47   
  HFOFARAACMc1
    Crack Barges-Brent M2        -10.00   -0.65      6.95    -9.35   
  HFOFARAACMc2
              (Reporting by Lee Yen Nee; editing by William Hardy)  ((lee.yennee@thomsonreuters.com)(+65-68703823)(Reuters Messaging: lee.yennee.reuters.com@reuters.net))  Keywords: MARKETS ASIA/FUELOIL