MANILA (AFX-ASIA) – Oil refiner Petron Corp will spend 6 billion pesos for capital expenditure in 2004, the bulk of which is intended for the upgrade of its refinery in Bataan, company vice president for corporate planning Ziyad Al-Shiha said. (US$1=55 pesos). Petron will also spend some 500-600 million pesos on expansion of its service…