SINGAPORE, May 15 (Reuters) - The Asia-Pacific crude market was mixed on Tuesday as limited supply and robust Japan demand lifted heavy sweets, but a possible prompt offer of Vietnamese Bach Ho could weigh on light grades. Vietnam's PV Oil is expected to offer Bach Ho for as prompt as May loading, traders said, as its sole 130,500 barrels per day (bpd) Dung Quat refinery will shut from Wednesday for three to four weeks. * TRADE - Inpex sold the only Van Gogh cargo for July loading to Japan at a premium of above $7 a barrel to dated Brent, higher than the previous month. Japan's demand for medium, heavy sweet crude is expected to surge this summer as all its nuclear reactors are shut on safety concerns. * TENDERS - Vietnam's PV Oil offered 12 cargoes of Nam Con Son condensate for loading between July and December in a tender as it markets the grade for the first time. Each cargo is 80,000 barrels. The tender will close on May 21 with bids valid until May 24. The condensate, with an API gravity of 59 and 0.012 percent sulphur, is usually marketed by Russian producer TNK-BP and is sometimes used in gasoline blending. - Russia's TNK-BP offered 730,000 barrels of ESPO to load on June 30-July 3. The tender will close later today. * MARKET NEWS - Japanese refiner Toa Oil Co restarted the 65,000 barrels-per-day crude distillation unit (CDU) at its Keihin refinery near Tokyo, on Tuesday, four days later than original scheduled, an industry source said. - The clock is ticking for a three-month tolling agreement that has supplied crude oil to the Coryton refinery in the UK, which was run by insolvent Swiss refinery Petroplus, to expire in less than 48 hours, a Member of European Parliament (MEP) said. - Sri Lanka expects a U.S. waiver of sanctions on imports of Iranian crude after the island nation took steps to cut imports from Iran by up to 38 percent, switching to alternatives from Oman and Saudi Arabia, the country's oil minister said. CRUDE Price Prev Change JUNE Brent 111.74 110.81 0.93 JUNE Brent/Dubai EFS DUB-EFS-1M 3.86 3.72 0.14 PRODUCT CRACKS Price Prev Change JUNE fuel oil crack -4.38 -4.80 0.42 JUNE gasoil crack 15.56 15.96 -0.40 JUNE naphtha crack -10.96 -9.59 -1.37 COMPLEX REFINERY MARGINS Today 6.19 Last 5 days 7.26 Last 365 days 7.61

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