Now is a perfect time to switch to synthetic oil if that's the route you want to take. When I bought my first FZ1 new, I switched from conventional to Amsoil full synthetic, it was pricey, but worked well. I then switched to Mobil One full synthetic and ran that for many seasons due to it being better on the wallet and readily available at any Automotive store, until I noticed the bike stated burning it after so many miles into the oil change. My research has concluded this is a common problem with Mobil One. I have since switched back to Amsoil. Never had any issues with the clutch or shifting and hardly burns any oil. I have contemplated just running Yamalube conventional for a season to see if there is any noticeable difference and save some cash in the process.