I have the change to buy an 08 exc 530 with 12,761 miles, 463 hours on it, but a complete top end rebuild ~500 miles ago. The guy says that the bottom end has never had any trouble in terms of mixing of oils like they are notorious for... no metal shavings, nothing wrong, so he never opened it up. It has a lot of extras on it. I was wondering how long you think the bottom end would last having 463 hours on it already? I can either get this one, or I am looking at an 07 with 200 hours and 9000k on it, but a bit more expensive and practically bone stock, no rebuild yet.