Aoa,
This is how I manage my car,
I change oil every 5000kms along with new oil filter every time.
Total 0w-20 with Toyota oil filter.
Air filter, Thailand make chnage every 10,000 kms.
Maintain proper air pressure, 33 psi.
Keep you car clean and keep away from mechanics.
These cars dont need tuning, especially dont touch the spark plugs.
If you want you can mix Hi Octane of 500/- per tank full.