Not necessary for mine. i use full sync though for a 10k servis interval. my service.. 1k, 6k, 11k, 20k... now only 23k. will do at 30k or next 6 month after service. which will be around september.

yes 15k usually just engine oil /oil filter change.

tyre rotation? at 15k usually no need. tyre balancing can be done on request. at sc they charge around rm15-20.
but it is not neccesary if there is nothing wrong. just u find steering vibrates when driving on a flat road. then u need tyre balancing

I was wondering if anyone's saga has lines on their car handle? the one inside when u put ur hand to open the door. I just can't seem to figure out how there are lines there when I don't even touch it when I open the door.. does anyone has the same problem?

u too? I think its obvious when you use a white car,  other colors can't see i think.. dunno why there are lines 
p.s. I tried taking pics but my camera phone not clear, so can't see the lines