My car is 2010 Model Corolla GLi 1.3L version and I have always used Toyota Genuine Oil 20W50 from the 3S dealer until about a year ago I switched to Caltex Havoline 20W50 and now using Shell Helix 15W40 (Yellow Dabba) as I couldn't source Havoline any longer and I was told Helix is better.
In all of these oils I didn't notice much difference in "Pick" of the car or in the fuel average, I'm getting around 12KM/L within city and around 14-15KM/L on long drives.
I'm using Guard Oil and Air Filter as they are quite cheap and do the work just fine.
Q#1 Next oil change is due and I'd like to know if Shell Helix 15W40 with Guard filters is a sensible choice or should I switch to something else but should be within the same price range.
Q#2 Also I change the oil and both filters after 2000-2500KM, is this the right interval?
@xulfiqar
guru ji need your recommendation