2016 XSR900 50th Anniversary model. Short OCI at ~2K miles, so just did an oil change and left the OG Ultra XG7317 oil filter intact. Filled with Castrol "Power 1" 4T 10W-40 full synthetic. That's what was also drained. Shifting seemed to start to get a little notchy already. The new Castrol fill did improve shifting. One thing I noticed with the Castrol Power 1 is that it foams more (can see it on top of the oil level in the sight glass) than the Valvoline conventional 10W-40 motorcycle oil I've also ran in this bike.
Going to try Valvoline 10W-40 full synthetic motorcycle oil next time ... 6-pack already bought on Amazon. Gold Plug magnetic drain plug picked up some ferrous "black sludge" as I call it. Probably mostly transmission gear wear, super fine ferrous particulate. Not as much as last oil change.
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