AOA Xulfiqar,
Thank you very much for the information provided above, I have Nissan Pino which is similar to Alto.
It would be great if you can further elaborate "Make Sure to Change all of it" as mechanic around does not even know how to check transmission Oil of these cars how come they be able to have idea of flushing cooler lines 
I had been trying to get my transmission Oil checked but got confused after having lot of different Opinions, some mechanics suggest to check with engine running while keeping car in Reverse, some suggest with engine running and car in neutral, some suggest within 90 sec of engine off............, My Car Dipstick clearly has Hot and Cold mentioned on it but no mechanic able to explain reason to mention cold on dipstick if oil is to be checked with engine running.
Plz help me with the situation.