This could be one of those correlation vs. causation issues, but.... I just had the oil changed and they filled it with Honda GN4 10-40. I immediately noticed a change in how the bike shifts. My best description is that things feel tighter. The long toss from 1 to 2 is gone and all gear shifts are now much more precise. It could be just a wear-in issue. I have about 6000 miles. I can't help but think the oil had something to do with this. The manual calls for 10-30. Anybody notice a change in how the bike shifts when you change the oil. I'm not complaining as this is a change for the better.