Thanks for the advice on the sediment, and I’ll treat it as normal with no worries.
Regarding the rear differential oil change interval of 30 000 km, I hate to tell you how long that fluid was in there, but substantially longer.
Even at 250 000 km, this CRV is still pretty good, but as she approches the crusher, my maintenance habits fall off pretty quickly. The oil that’s in her now just might be lubricating the future “crush”.