SINGAPORE, April 2 (Reuters) - Asia-Pacific crude market is likely to come under pressure this week as several May cargoes are still available even though most of the refiners have completed their purchases. The available cargoes include light sweet crude such as Cossack, Kitan and North West Shelf (NWS) condensate and heavy sweet grades Vincent and Enfield. Vietnam's PV Oil will award Chim Sao this week, which could be sold at lower premiums in line with other Vietnamese grades, on lower demand due to seasonal maintenance at refineries. * OSPs - Malaysia and Indonesia, two major oil exporters in Asia, raised the official selling prices (OSPs) of their crude to the highest in more than three years on tighter supply and robust demand from power plants in Japan and Asian refiners, trade sources said. Prices could rise further in April for Malaysian grades as the alpha factor, used in determining OSPs, is likely to hit a new high after April cargoes were sold at higher premiums compared with March, they said. In Indonesia, the Minas OSP MIN-OSP has been calculated at $131.50 a barrel for March, the highest level since $138.73 in July 2008. Malaysia's state oil firm, Petronas, has set the official selling price for Tapis crude TAP-OSP for March at $133.98 a barrel, $6.43 a barrel higher than the previous month. * TENDERS - More details emerged with regard to Rosneft's ESPO and ONGC's Sokol tenders. Rosneft sold its May 19-22 ESPO cargo to BP at a premium of about $3.50 a barrel to May Dubai quotes while the May 31-June 2 cargo went to Glencore at about $4.80 to June Dubai quotes. ONGC sold a May 26-29 Sokol cargo to Petraco at about $7.20 a barrel above Oman/Dubai quotes while a May 16-19 cargo went to BP at a premium of about $7.30 a barrel. - India's MRPL issued a tender seeking 600,000 barrels of low sulphur crude for June 1-15 loading. The tender will close on April 11 with bids valid until April 13. * MARKET NEWS - Qatar is currently producing 720,000-730,000 barrels per day of oil and is running "flat out" in crude and LNG production, Oil Minister Mohammed Al-Sada said. - At least three Japanese firms including two oil refiners will not lift any Iranian crude in April as the third-biggest buyer of Iranian oil comes under pressure from the United States to curtail purchases, industry sources said. - Sudan and South Sudan on Sunday accused each other of launching attacks in the oil-producing area straddling their border after talks aimed at ending the worst hostilities since Juba declared its independence were delayed. CRUDE Price Prev Change MAY Brent 122.80 122.90 -0.10 MAY Brent/Dubai EFS DUB-EFS-1M 4.05 4.19 -0.14 PRODUCT CRACKS Price Prev Change MAY gasoil crack 16.04 16.57 -0.53 MAY fuel oil crack -5.42 -5.63 0.21 MAY naphtha crack -7.56 -7.18 -0.39 COMPLEX REFINERY MARGINS Today 6.61 Last 5 days 6.38 Last 365 days 7.71 (Reporting by Florence Tan and Osamu Tsukimori in Tokyo; Editing by Alison Birrane)

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