A glut of the largest oil tankers in the Persian Gulf was poised to remain unchanged for a second week, a Bloomberg News survey showed. There are 17.5 percent more very large crude carriers for hire over the next 30 days than there are likely cargoes, the median estimate in a survey of six shipbrokers and owners today showed. That's the same as on Oct. 30 and Oct. 23, according to previous surveys. VLCCs on the Saudi Arabia-to-Japan voyage, the benchmark route for supertankers sailing to Asia, are losing $1,799 daily, figures from the Baltic Exchange in London showed. Returns were positive in only four sessions so far in the second half. Each vessel can hold 2 million barrels of oil.