EVEN before the new excise tax law on petroleum products takes effect, oil companies will raise the prices of diesel and kerosene this week while retaining the price of gasoline.

Flying V said it would jack up the prices of diesel and kerosene by 55 centavos per liter and 30 centavos per liter, respectively, but will leave the price of gasoline unchanged effective at 12:01 a.m. on Tuesday.