which oil is better for diesel??

[XTO]

Btw, do you know the producer of the proprietary Isuzu Genuine Engine Oil.

Jayson's - dealer of isuzu genuine parts in j. abad santos manila confirmed me this. Isuzu Genuine Motor Oil SAE 40 and locally made Caltex (Delo Gold or Silver Monograde) is the same though some tsikoteer noticed that some casa filled the IGMO container with Castrol naman might be possible that some casas use other brands too since majority of them don't allow the owner within their work area.