I changed my OE oil at 1000km with mineral 15w50 Yamaha oil due to being 12 months old (bike was a dealer demo). Then at 2500km I changed to full synthetic Motul 300v so far at the 4000km mark the oil level is unchanged. I think 10000km on a mineral oil is a bit too much for the oil, the mineral oil that had done 1500km was discoloured and smelt like it needed to be changed. Now that the Motul has done 1500km it has hardly discoloured and doesn't smell bad either, another 1000km and it will be changed.