Valero takes down gas oil unit at Corpus refinery

company spokesman declined to comment. Exxon Mobil Corp. (NYSE:XOM) Valero Energy Corp. (NYSE:VLO) ConocoPhillips (NYSE:COP) Royal Dutch Shell PLC (RDSA, RDSA.LN) was restarting May 17 a hydrocracker at its 155,600 barrel-a-day refinery in Martinez, Ca.,...