Not to say there was an excessive amount, but there was a bit. Also though it was hard to tell over the normal 2T noise of an RM250, I thought I was also hearing a strange knocking. The only undeniable symptom proved to be the rings collapsing. Upon pulling the top end for a believed ring failure found pitting in the head and the piston. Glad we decided to split the cases... Luckily no damage to any of the components. Cylinder, crank, cases and transmission are still in great shape. The head needs some smoothing out and some new mains pressed in, but that is it. It's an 2001 RM and the engine still looked pressed from the factory. Since getting new jobs and moving haven't ridden it as often as we used to and I would attribute not believing I heard the noise to infrequent rides. Lesson learned is to just suck it up and split the cases one weekend if you notice any glitter. Boyfriend is afraid using 10w40 in the last oil change might have had something to do with it too.