I have been wondering about the silver too. I have not seen any UOA's for Buells, and the Harley's did not show any silver. Is this a problem or area of concern?
I chose a diesel 15W/40 oil based on the recommendation of a long time desert rider with Harleys and BMWs. He said Delo, Rotella, and Delvac were robust oils that could take the heat, had great anit-wear additives, would lower engine temps, were readily available, and the price was great.
BTW- this is the most fun to ride bike I have ever owned! It makes power at low rpm's and wheelies with just a twist of the throttle. You have great visibility commuting since you sit so high, the riding position is upright and comfortable, and the torgue lets you zip through traffice with ease. The same applies to touring.
The suspension handles dirt roads without drama, and it is fun to spin the rear tire up. But soft dirt is a handful for me, I don't have any off-road dirt experience.
The real giggle factor though is the sportbike handling this bike has. Mountain and canyon roads are a blast. It is so easy to ride this bike fast. A comfortable sportbike- who'd a thunk such a thing was possible.
It is truly a do everything motorcycle.