Follow your car's manual. That would guide you on what oil to use.

I never use additives. Waste of money. A good engine oil brand have those additives mixed in it already.

Engine flush? It would be fine if your car is under 5 years old. But I wouldn't recommend it for older cars. Baka magka-leak lang kasi matatanggal ung mga dumi sa loob na maaari ding nagsisilbing "plug" sa mga worn gaskets etc...

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