I own a 2012 Corolla 1.6 Altis that is currently at 150,000km.
Over the past year I have experienced loud engine noise with high RPM and a rattling noise from the engine. Also a a significant drop in fuel average despite having a light foot.
I read articles about using a thicker oil for cars with high mileage.
Should I change 10w-40 or 20w-40 oil?
Or is there something else I can do?