No need to change at 30k mileage
Recommended is 60k
And only use Suzuki Ecstar 75w oil its now available in 1 litre packs as compared to previously available tin pack which was very expensive.
1 litre pack is around 3-4k.
My Ags was giving extreme jerks, I showed to different mechanics including Suzuki dealership. Some said change oil and 1 even said transmission is faulty will have to open and see.
At the end a simple 1000 rupees throttle body and plug cleaning service from road side mechanic solved the problem 100% with smooth shifts, even better than when I drove it out of the dealership brand new.
but its been 6 months now and ive started feeling slight jerks again but nothing like the previous problem.