Sorry to dig this up. Do you change every 6 months or 8-10k? I don't hit 8k in 6months
For high performance car, I will change every 3 months or 5k mileage whichever come first.
For normal B&B car, I will change every 6 months or 10k whichever is earlier.
For Conti cars, I will change every 6 months or 7.5k whichever is earlier.
This is because in sg , we travel mainly short distances and a lot of idling.
Changing oil frequently will make sure your engine oil is still working well to clean all the contaminants and provide enough lubrications/shear viscosity stability.
A good engine oil have better detergent/cleaning properties to prevent sludge and varnish, it is also better at protecting the internals at high temperature.
This is from my personal experience after trying different oil on different vehicles and sending for UOA.