so guys the verdict is to just have regular oil and filter change and use oil recommended by your car manufacturer.

Thanks for the insights. My kumpare is marketing an oil additive so I searched first to find out what experts here in the forum has to say about the use of additive. Lahat naman kasi tayo gustong makatipid sa gas consumption natin at mapahaba ang buhay ng engine at kotse natin.

Thanks again,
knight-rider