Bro manual ka 10K p 1st hota h, next at 40K
In 2017 1st change 5K p hota tha even mene bhi 5K p krwaya tha
2018 se officially pak suzuki ne 1st gear oil change interval 10K krr dia h
Onwards 40k- so on
Answer to your question, yes gear oil change hoga
It roughly costs 800 approx, not a big deal
Other than gear oil, as usual, air filter, oil and oil filter
Oil filter approx 700, air filter upto 2100 (latest prices)
And if you go for 0w-20 (4L pack) then 4145 if 5w-30 3L, 2700
I will recommend 0w-20
(If you have budget then I will recommend 10K periodic maintenance, includes throttle service, wheel balancing alignment brake service etc, costs 2.5-3K depending upon dealership)