I've recently bought a used motorbike and am unsure of how to gauge the age/condition of its oil: Neither did I fill the oil in the first place (so I don't know what colour it used to be) nor have I got much experience in what motorcycle oil "usually" looks like:
As you can see in the photo above, the dipstick is wet up to the first "ridge", and it is a dark albeit transparent caramel (but not black or opaque brown). Does the oil look to be in "maintained" condition?-- Should I simply wait until the next scheduled check-up to replace it (which is in about 500km anyway)?