guys, there seems to be a problem lately in my saga blm, manual tranny.
it has 20k km on the clock..
recently its seldom used, it travels about per day about 5km +- .
however, since d past few days, its slipping in first gear. something like driving ur car on loose mud surface.

is it a worn out clutch plate or could it be time to replace the gear oil?
as far as i know, proton never changed the manual tranny oil for me before..