What kind of oil do you put in the clutch on your Yamaha yfz450?

Mobil One Race 4T...Clutch is in the crankcase..so the clutch is lubricated with the same oil as the rest of the engine...Mobil one is full synthetic, and I have been told not to run less than 20w50, although I use 10w40 in my yzf 450 and my yzf-r1......