YEAH!!! I just got it!!
I used PB blaster, had read on other threads that it is good on stuck parts.
Couple of good twists with the 19mm and extension, to the left, and it came off.
Granted, I do lift weights a couple times a week, but a bodybuilder I am not...
I'm a girl, so no excuses now from any of you guys.
Lots of water came out.
I wonder why the water coming out of the radiator drain is so rusty looking, while this water out of the block came out a lot clearer?
Edit: this is for the 240D, does not have turbo, a/c or other stuff in the way, so perhaps my engine has (a bit) more room to maneuver.