Petron Corp. plans to invest US$1.5 bln over the next two years to upgrade its Bataan refinery, enabling it to comply with European emission standards called Euro4 by 2012. Euro4 means having 0.001% sulfur content. The complexity of the refinery is being changed to crack 100% of its crude oil. The planned refinery upgrade would include having additional units of Petro Fluidized Catalytic Cracker (PetroFCC 2) needed to fully convert residual products to higher-value gasoline, liquefied petroleum gas, diesel and propylene. The petrochemical byproducts would have captive consumtion.