The best, Most Important thing you can do for your new or used bike is this............. Drain the oil, add new filter. Then buy Motul 300V. This is a full synthetic oil with compounds designed keep the parts lubricated even after normal oil drains in to the pan. This oil is Great, it will gradually polish your internal moving parts and keep them protected better than anything out there. It has a zinc compound that is magnetically charged to make the oil stick to the parts for long periods of time. Ride safe and conscience.