umm ive heard of a well flogged gpx750 doing 208,000 km...and it was "well ridden"...
so many things to consider-especially if u dont kno the full history- id suggest maybe an oil change every 3000km & filter at 6000km (every 2nd change)...tho i always run 6000km on my fireblade and its got 60,000km on it now, no worries either..
make sure u use bike oil tho (friction modifiers etc)..