Do share your experience specially if there is improvement in WOT response with Euro5 Ron97
Regarding oil change, I usually do it at 5000kms but sometimes it goes till 6500kms. I have found the oil life meter to be very handy in calculating the remaining oil life. I have observed that the oil life meter keeps reducing kms count even when the car is stationary and engine is running with A/C. So it is a very good estimate of oil life considering that it considers additional parameters like rpm and engine running time etc.
I would suggest to change when oil life meter shows 5000kms left just in case. In some cases it will reach 5000 earlier than you odo does 5000 and in somecases later depending on how you drive and conditions.
Air filter is condition based. I drive in dusty area so in my 18000kms, I have changed it 3 times. I keep one spare filter at home and change it myself when required.