I use only Amsoil, and change it every 4,000 miles. While I agree you can extend the change interval beyond that, but I like to keep an eye on the oil to see the amount of metal shavings that are suspended. An oil analysis will really help you, but make sure your engine is fully broken before you mail your sample in. My bike (Ducati Multistrada 620) takes about 5,000 miles for the clutch to be fully broken in. Until the 5,000 mile point, I was changing oil every 2,000 miles to make sure all of the clutch material was removed on a regular basis.
'I use my cigar smoke as idiot repellent'
Yeah, that’s a statistic sample size of 1, category “anecdotal evidence”, but there it is.
"You just got killed by a Daewoo Lanos motherfu#&er!!" -Red, from Pineapple Express.