Why settle for the synthetic blend when for a few additional hundred pesos you can get the fully synthetic variety (PHP1,683 vs. PHP1,296)?
LAZADA: MAG 1 5W30 GM Dexos1 Licensed API SN Certified Full Synthetic Oil Gasoline Engines 4L PN#67936
Also, at 75,000 KM we still couldn't say that your car is a high mileage car already. Probably if at 150,000 KM or more.