I hope every buddy is doing fine.

I own Toyota corolla XLI 2010 (85000 km) that i bought last year, i want to know what servicing is necessary on each oil change?

I used to change the oil (zic) at 4000 kms but now i change the oil after 2000 kms only since there is not much running of my car and its on petrol from last 6 months (cng installed but dont use it from last 6 months).

what is carbon cleaning?

Any other information shared will also be appreciated, since i never own 1300cc car before so doesn't know much about it.