Ok, I know we like to obsess on this forum, but this takes the prize. First, unless brand new, or a rebuild, it's not empty. You most likely ran it before the change, it's well coated, and it's shouldn't take much time between drain and refill. Trying to get much oil in a vertical (upside down) or horizontal filter, and get it on the car sounds like poor idea, that is bound for mediocre results at best. I put the the filter on, fill the crankcase, and start er up and let it idle. Let's see, òil remained from previous fill, new oil poured through engine, and idle is a no load condition, what's the reason to try to fill the filter? I would venture a guess that literally millions of cars over multiple millions of miles without filling the filter at oil change with no identifiable failures is good enough for me. I'll obsess about something else....like the difference between QSUD, Synpower, PP, etc!