That's when I prefer to drain the oil , as you said all the oil is drained down. It just needs to be left dripping for a bit longer so the cold oil comes all out. I try to let the bikes drain overnight if possible, even a couple days since I have enough bikes to ride. Heating it up before draining maybe helps the "dirt" stay in suspension and drain better, but I think when left draining for long enough time it all comes out , or as good as any other way.
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