better follow the API rating. madami naman na CH-4 or above na oil. and reason kung bakit kailangan ng CH-4 or above is becuase of the EGR valve. and using of better oil will prolong the turbo life. please correct me if im wrong here.

mga nagamit ko na oils na CI-4 rated ay:

Top1 Synthetic Diesel Oil = 260-300 pesos per liter
Zic Up semi-synthetic oil = 220-250 pesos per liter

parehong semi-synthetic yan. and both are good quality oils. antayin natin yung comments ng ibang gurus dito.