Thanks for the replies.
@Davy, it's the time belt not drive belt.
@Rumesh, I used to service from the A*W all the time. they are asking to do this (they ask to change not to inspect and change). But in the manual it says to change it every 100,000 kms. they don't mention a time limit for that.
See the alto manual here: http://www.manualslib.com/manual/541447/Suzuki-Alto.html?page=84
i'm also thinking of wait for some time and change it but they said it's a risk.
Do you know a way to check the condition of time belt without disassembling the engine?
/Rukshan