By Florence Tan and Anmol Choubey (Reuters) -Exxon Mobil Corp has started production at new facilities at its Singapore oil refinery complex to produce base stocks from residue fuel, it said on Tuesday, boosting the plant's intake of high-sulphur crude. The technology combines processes to convert fuel oil and other bottom-of-the-barrel crude products into higher-value lube base stocks and distillates, Exxon said in a statement. The new facilities expand its Group-II base stocks production capacity by 2 ...