SINGAPORE: Vitol, the world's largest independent oil trader, has started building a small oil refinery at its terminal in Malaysia that will provide low-sulphur fuel oil for ships, a senior company official said on Monday.The project consists of a crude distillation unit that can process 30,000 barrels per day of crude and is located on the same site as Vitol's oil storage terminal at Tanjung Bin in the southern Malaysian state of Johor, Vitol Asia's President and Chief Executive Officer Kho Hui Meng said on the sidelines of a conference.