Chevron Delo 400 and Shell Rotella T are popular diesel oils that have proven themselves. Some of our members run them sucessfully. Dunno if the brand names are the same in the Philippines.
By the way, my all time favorite radio personality, Art Bell, lives in your beautiful country.
Check out this
link for more information.
Edit; Gary7 beat me by one minute. He knows quite a bit about oil, listen to him.