thanks for the replies! according to my dial, ang kotse ko ay nakapaglakbay na ng halos 700,000miles.. hehehe.. with a one or two times overhauled na yung engine.. thanks po sa advice sir nikko! sir jarhead, what about the multigrade 15w-40 or higher types? is it synth already? or another mineral oil that is higher quality? wala pa po kasi akong gaanong alam pag dating sa oils.. pinagaaralan ko pa lang kasi sa ngayon naman po, my car has an acceptable "hatak" or power using SAE-40 for atleast 7months na.. dapat nakapag pachange oil na nga ako eh.. ipon muna.. kaya ako nagbaka sakaling mag semi or synth kasi, baka mas malubricate niya ng mas maayos and mas gumanda yung hatak nung engine and mas onti yung drag sa piston and other areas that needed to be lubricated inside the engine.

cheers!!!