Oil was mixed in Asian trade ahead of an OPEC ministerial meeting due to take place later in Vienna.New York's main contract, light sweet crude for July delivery, gained seven cents to 99 dollars 16 cents a barrel. Brent North Sea crude for July delivery lost 48 cents to 116 dollars 30 cents.The 12-nation Organisation of the Petroleum Exporting Countries, OPEC, is expected to discuss whether the oil cartelshould raise production quotas to aid the struggling global economic recovery and compensate for hobbled Libyan output.