Hello po mga boss,
I just have my car serviced at prens to replace the valve cover gasket, ito ang loob ng makina,maitim siya compared sa mga commercial ng tv hehe, sabi ng mekaniko kailangan daw i flushing para matangal ito. sinubukan namin tangalin at lumabas naman yung kintab ng metal parts. ang tanong ko lang ay:

1. how effective is flushing the engine to remove the black oil that covers the metal parts?
2. if flushing is the best way,what brand, how much liters of oil is needed for the process?
3. pwede ba ito maging effect ng oil na gamit ko? my oil is Apex semi synthetic / SAE 15w/50 (fortified with pertua oil additive). do i need to switch to imported oil?

naka 22K km na po ang kotse since last oil change, ride is civic 99. hope to hear some inputs sa inyo. TIA