The gearbox oil was fairly clean after nearly 19k km / 12k miles, as it should be since the change interval is more than 3 times that, at 60,000 km / 37k miles. There was a mild amount of metal shavings/power on the inside/upside the very bottom of the filter. Considering it is the original oil, the amount of metal seemed low to me.
However, on the outside/downside of the filter, the same side where the pulling prong for filter removal is fitted, there was a lot of plastic crumbles. They could be from the same material the filter cage, as the color and consistency looked very similar, but I have also seen some glues looking like this. There were more bits than seen in the picture - some were lost in the oil and also rag - but I would expect more than half are still present and presented.
Exactly 500 ml came out, and I added the same amount.
I also changed the engine oil and filter. After 6000 miles it had turned more brown than red, but there was not much dirt. I drained all oils cold and let them drain for 24 hrs. There was hardly any metal shavings on the magnetic drain plug for the engine oil.
The final drive unit showed significantly more shavings on the magnetic drain plug. You can only fit a thin walled socket there, or you will have to use an open end 17 mm wrench. Change interval is listed at 30,000 km, or just under 20k miles, so my bike should be just a bit more than halfway to that. This is definitely the oil that looked most ready to be replaced of the three. It was dark, and as mentioned wear was clearly visible. I would say it looked a little worse the engine oil in my Virago after 5,000 miles, but that also contain the clutch, primary and secondary drive as well as the gearbox. The final drive on my earlier shaft drive bikes have had less shavings by some margin than the Roamer, but that could be because they are older - I expect wear to be heavier in the beginning when things wear to fit each other. Still, I do not find the wear alarming in any way.
After drying off the drain plug of the final drive
