Mineral , semi synthetic or fully synthetic?

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Yung sa diesel masyado naman yang maiksi. Diesel sa akin at parehong turbochrged pero kahit mineral oil, 5,000kms or 6 months OCI lang puwede na. Never had any problems sa engine. Basta API CH and up lang gamit ko kasi yun bagay sa turbo diesel. Preferably API CI rated oil.

Maganda na mga langis ngayon.

That's already covered. Meron naman note sa baba.

*Oil change interval may be extended based on oil analysis but must not exceed 1 year.