I've run this oil in all my sportbikes for years now. I tried a few different full-synthetic oils from other reputable manufacturers in my FZ6, and none were as quiet or smooth as the Repsol. I change it every 6000 miles, which is 2-3 times a year. Expensive, but worth it. My FZ6 had 40000 miles on it and never needed a valve adjustment. I'll run nothing else in my bikes. I put this in some of my dirtbikes too.