Yes, it gets changed often because I am racing it, it was changed right before my race. It was done by a motorcycle mechanic, hopefully using the right oil, but I can check. What should I look for as a bad oil or additive for a race bike? This bike has a CR250X dirt bike engine.
Thanks for the tip about the oil as something to watch for.
I'll be changing the clutch anyway due to a high number of hard hours I've put on it, it's almost certainly due for it.
Look out for additives of any kind, if in doubt use the pure mineral oil with no synthetic stuff in it . Motorcycle oils have special specification codes, I'm not sure if this is international, here in Germany the norm for motorcycle oils is "JASO MA" .
HTH