So here's a confession:
Changed the filter, poured in some fresh oil for winter sleep, and topped the final bit from another bottle.
I saw the dirty oil go into the engine and with it went a CHUNK of SLUDGE !!
I won't start the bike 'til spring, so it's not gonna hurt it over the winter, BUT ...
Can I just drain it out in the spring before I ride, or before that, do I need to flush the mother with some magic stuff and refill to ride?
That's what a dingy shed can do for your smarts, eh?
Don't leave old stock in bottles near your changing area. Get it recycled before I get there to help you change your oil.