A few weeks and 2K miles ago I switched from Vic oil to Mobile 1 10W 40 full synthetic and while I've not experienced any clutch slippage, the bike is running hotter than it ever has. I've ridden in as hot or hotter weather prior to the change. I've experimented with the lower fairing opening. I'm now even feeling heat from under the seat whereas before it was just engine heat on the lower legs. Previously when under way, very little heat was noticeable but such is no longer the case. I almost went with Rotella but thought I'd give this stuff a try. It won't be going in again at the next change.