mine, i usually follow the 10kkm PMS altho pricey i'm using fully synth oil but change oil filter & top up every 5kkm...i'm a distance traveled PMS follower than time interval (no. of months) coz how can you know the trouble/s of you're rig if you only utilized it once in awhile...

but those using mineral oil, better to follow the 5kkm or earlier change oil for added protection and assurance bcoz of lower grade oil...HTH