Thanks, guys, this does sound reasonable. I will talk about this with my mechanic and then decide on the best course of action. I may continue commuting and riding the bike on dirt/gravel roads around my home town to see if the issue manifests itself in these conditions - I am not too concerned about gearbox failure this close to home as organizing a "rescue mission" is much easier and cheaper here. I will definitely take the gearbox apart for inspection before I undertake another lengthy trip.



BTW, I did an oil change this past weekend and it looks like ~400ml of oil were consumed on this ~5000km trip. The oil filter seemed fine - no dust, no metal shavings, just used darkened oil on it.