Hmmm. That 160,000 miles most likely does not include too many 1/4 miles; which may place a limit on longevity; though my previous 836 build lasted till 2019, since '81.
And that build included Barnett clutch, which would try to 'walk' at red lights; as you describe Per.
Surprisingly, this year's 836 motor has OEM clutch, running with no slip; while starter clutch is engaging about 1 out of 4 try's.
Ken from CYCLE X had suggested DRIVEN racing oil, which I purchased while finishing my rebuild. But I do 'speculate', that somewhere down the road, I'll likely try SPECTRO, since there seem to be no negative reports.