change oil

hi, i have a 98 wr 400 and use it for primarily city riding,i even plan to motard it,my question is, how oftrn do i have to change oil?Some threads here said that i have to change oil every 300km, does it apply to my kind of rididng or is it only for the frequent offroaders?

oil is cheap insurance..... I do mine every 1000 km on th street oil and filter.... offroad probally every coupel rides, then change the filter every second oil change.

every 1000km and filter every other change, never done mine any harm.

Check Valves every 1000km aswell

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