30000 miles? so something around 50000 km ?
from my experience this is the minium what a gearbox should last, presumed that the bike isn't treated to bad and everything is mounted in perfect manner.
you should try a 14 teeth sprocket, it helps to ease the life of the gears.
avoid strong acceleration in low revs, especially in upper gears. do not ride in 5 th gear when speed is below 100 km/h (avoid riding below 4000 revs on longer distances).
your bike should have the external oil hose for gearbox greasing and the big oil pump, so from this side there isn't very much you can do.
use motorcycle engine oil; car oils are not designed to grease gearbox as well.
so far,
regards
klaus
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