I'm due to replace my Engine Oil, pero hindi ko alam kung anong oil gagamitin ko. I have this discount coupon sa shell, pero if there are other oil brands na ok other than Helix, il go for it. Ano kaya ok na engine oil, synthetic and non synthetic, medyo low budget kasi tayo eh, kaya i'm not sure kung kuha ako synthetic oil kasi mahal, nasa almost 2000 per 4 liters. Kayo po ano gamit nyong oil for your cars? Thanks!